1 /* 2 * fs/nfs/nfs4proc.c 3 * 4 * Client-side procedure declarations for NFSv4. 5 * 6 * Copyright (c) 2002 The Regents of the University of Michigan. 7 * All rights reserved. 8 * 9 * Kendrick Smith <kmsmith@umich.edu> 10 * Andy Adamson <andros@umich.edu> 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 28 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 33 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 34 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <linux/mm.h> 39 #include <linux/delay.h> 40 #include <linux/errno.h> 41 #include <linux/string.h> 42 #include <linux/ratelimit.h> 43 #include <linux/printk.h> 44 #include <linux/slab.h> 45 #include <linux/sunrpc/clnt.h> 46 #include <linux/nfs.h> 47 #include <linux/nfs4.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/nfs_page.h> 50 #include <linux/nfs_mount.h> 51 #include <linux/namei.h> 52 #include <linux/mount.h> 53 #include <linux/module.h> 54 #include <linux/xattr.h> 55 #include <linux/utsname.h> 56 #include <linux/freezer.h> 57 #include <linux/iversion.h> 58 59 #include "nfs4_fs.h" 60 #include "delegation.h" 61 #include "internal.h" 62 #include "iostat.h" 63 #include "callback.h" 64 #include "pnfs.h" 65 #include "netns.h" 66 #include "sysfs.h" 67 #include "nfs4idmap.h" 68 #include "nfs4session.h" 69 #include "fscache.h" 70 #include "nfs42.h" 71 72 #include "nfs4trace.h" 73 74 #define NFSDBG_FACILITY NFSDBG_PROC 75 76 #define NFS4_BITMASK_SZ 3 77 78 #define NFS4_POLL_RETRY_MIN (HZ/10) 79 #define NFS4_POLL_RETRY_MAX (15*HZ) 80 81 /* file attributes which can be mapped to nfs attributes */ 82 #define NFS4_VALID_ATTRS (ATTR_MODE \ 83 | ATTR_UID \ 84 | ATTR_GID \ 85 | ATTR_SIZE \ 86 | ATTR_ATIME \ 87 | ATTR_MTIME \ 88 | ATTR_CTIME \ 89 | ATTR_ATIME_SET \ 90 | ATTR_MTIME_SET) 91 92 struct nfs4_opendata; 93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data); 94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); 95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr); 96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 97 struct nfs_fattr *fattr, struct inode *inode); 98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 99 struct nfs_fattr *fattr, struct iattr *sattr, 100 struct nfs_open_context *ctx, struct nfs4_label *ilabel); 101 #ifdef CONFIG_NFS_V4_1 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 103 const struct cred *cred, 104 struct nfs4_slot *slot, 105 bool is_privileged); 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *, 107 const struct cred *); 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *, 109 const struct cred *, bool); 110 #endif 111 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 113 static inline struct nfs4_label * 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 115 struct iattr *sattr, struct nfs4_label *label) 116 { 117 int err; 118 119 if (label == NULL) 120 return NULL; 121 122 if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0) 123 return NULL; 124 125 label->lfs = 0; 126 label->pi = 0; 127 label->len = 0; 128 label->label = NULL; 129 130 err = security_dentry_init_security(dentry, sattr->ia_mode, 131 &dentry->d_name, NULL, 132 (void **)&label->label, &label->len); 133 if (err == 0) 134 return label; 135 136 return NULL; 137 } 138 static inline void 139 nfs4_label_release_security(struct nfs4_label *label) 140 { 141 if (label) 142 security_release_secctx(label->label, label->len); 143 } 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 145 { 146 if (label) 147 return server->attr_bitmask; 148 149 return server->attr_bitmask_nl; 150 } 151 #else 152 static inline struct nfs4_label * 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry, 154 struct iattr *sattr, struct nfs4_label *l) 155 { return NULL; } 156 static inline void 157 nfs4_label_release_security(struct nfs4_label *label) 158 { return; } 159 static inline u32 * 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label) 161 { return server->attr_bitmask; } 162 #endif 163 164 /* Prevent leaks of NFSv4 errors into userland */ 165 static int nfs4_map_errors(int err) 166 { 167 if (err >= -1000) 168 return err; 169 switch (err) { 170 case -NFS4ERR_RESOURCE: 171 case -NFS4ERR_LAYOUTTRYLATER: 172 case -NFS4ERR_RECALLCONFLICT: 173 case -NFS4ERR_RETURNCONFLICT: 174 return -EREMOTEIO; 175 case -NFS4ERR_WRONGSEC: 176 case -NFS4ERR_WRONG_CRED: 177 return -EPERM; 178 case -NFS4ERR_BADOWNER: 179 case -NFS4ERR_BADNAME: 180 return -EINVAL; 181 case -NFS4ERR_SHARE_DENIED: 182 return -EACCES; 183 case -NFS4ERR_MINOR_VERS_MISMATCH: 184 return -EPROTONOSUPPORT; 185 case -NFS4ERR_FILE_OPEN: 186 return -EBUSY; 187 case -NFS4ERR_NOT_SAME: 188 return -ENOTSYNC; 189 default: 190 dprintk("%s could not handle NFSv4 error %d\n", 191 __func__, -err); 192 break; 193 } 194 return -EIO; 195 } 196 197 /* 198 * This is our standard bitmap for GETATTR requests. 199 */ 200 const u32 nfs4_fattr_bitmap[3] = { 201 FATTR4_WORD0_TYPE 202 | FATTR4_WORD0_CHANGE 203 | FATTR4_WORD0_SIZE 204 | FATTR4_WORD0_FSID 205 | FATTR4_WORD0_FILEID, 206 FATTR4_WORD1_MODE 207 | FATTR4_WORD1_NUMLINKS 208 | FATTR4_WORD1_OWNER 209 | FATTR4_WORD1_OWNER_GROUP 210 | FATTR4_WORD1_RAWDEV 211 | FATTR4_WORD1_SPACE_USED 212 | FATTR4_WORD1_TIME_ACCESS 213 | FATTR4_WORD1_TIME_METADATA 214 | FATTR4_WORD1_TIME_MODIFY 215 | FATTR4_WORD1_MOUNTED_ON_FILEID, 216 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 217 FATTR4_WORD2_SECURITY_LABEL 218 #endif 219 }; 220 221 static const u32 nfs4_pnfs_open_bitmap[3] = { 222 FATTR4_WORD0_TYPE 223 | FATTR4_WORD0_CHANGE 224 | FATTR4_WORD0_SIZE 225 | FATTR4_WORD0_FSID 226 | FATTR4_WORD0_FILEID, 227 FATTR4_WORD1_MODE 228 | FATTR4_WORD1_NUMLINKS 229 | FATTR4_WORD1_OWNER 230 | FATTR4_WORD1_OWNER_GROUP 231 | FATTR4_WORD1_RAWDEV 232 | FATTR4_WORD1_SPACE_USED 233 | FATTR4_WORD1_TIME_ACCESS 234 | FATTR4_WORD1_TIME_METADATA 235 | FATTR4_WORD1_TIME_MODIFY, 236 FATTR4_WORD2_MDSTHRESHOLD 237 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 238 | FATTR4_WORD2_SECURITY_LABEL 239 #endif 240 }; 241 242 static const u32 nfs4_open_noattr_bitmap[3] = { 243 FATTR4_WORD0_TYPE 244 | FATTR4_WORD0_FILEID, 245 }; 246 247 const u32 nfs4_statfs_bitmap[3] = { 248 FATTR4_WORD0_FILES_AVAIL 249 | FATTR4_WORD0_FILES_FREE 250 | FATTR4_WORD0_FILES_TOTAL, 251 FATTR4_WORD1_SPACE_AVAIL 252 | FATTR4_WORD1_SPACE_FREE 253 | FATTR4_WORD1_SPACE_TOTAL 254 }; 255 256 const u32 nfs4_pathconf_bitmap[3] = { 257 FATTR4_WORD0_MAXLINK 258 | FATTR4_WORD0_MAXNAME, 259 0 260 }; 261 262 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE 263 | FATTR4_WORD0_MAXREAD 264 | FATTR4_WORD0_MAXWRITE 265 | FATTR4_WORD0_LEASE_TIME, 266 FATTR4_WORD1_TIME_DELTA 267 | FATTR4_WORD1_FS_LAYOUT_TYPES, 268 FATTR4_WORD2_LAYOUT_BLKSIZE 269 | FATTR4_WORD2_CLONE_BLKSIZE 270 | FATTR4_WORD2_CHANGE_ATTR_TYPE 271 | FATTR4_WORD2_XATTR_SUPPORT 272 }; 273 274 const u32 nfs4_fs_locations_bitmap[3] = { 275 FATTR4_WORD0_CHANGE 276 | FATTR4_WORD0_SIZE 277 | FATTR4_WORD0_FSID 278 | FATTR4_WORD0_FILEID 279 | FATTR4_WORD0_FS_LOCATIONS, 280 FATTR4_WORD1_OWNER 281 | FATTR4_WORD1_OWNER_GROUP 282 | FATTR4_WORD1_RAWDEV 283 | FATTR4_WORD1_SPACE_USED 284 | FATTR4_WORD1_TIME_ACCESS 285 | FATTR4_WORD1_TIME_METADATA 286 | FATTR4_WORD1_TIME_MODIFY 287 | FATTR4_WORD1_MOUNTED_ON_FILEID, 288 }; 289 290 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src, 291 struct inode *inode, unsigned long flags) 292 { 293 unsigned long cache_validity; 294 295 memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst)); 296 if (!inode || !nfs4_have_delegation(inode, FMODE_READ)) 297 return; 298 299 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags; 300 301 /* Remove the attributes over which we have full control */ 302 dst[1] &= ~FATTR4_WORD1_RAWDEV; 303 if (!(cache_validity & NFS_INO_INVALID_SIZE)) 304 dst[0] &= ~FATTR4_WORD0_SIZE; 305 306 if (!(cache_validity & NFS_INO_INVALID_CHANGE)) 307 dst[0] &= ~FATTR4_WORD0_CHANGE; 308 309 if (!(cache_validity & NFS_INO_INVALID_MODE)) 310 dst[1] &= ~FATTR4_WORD1_MODE; 311 if (!(cache_validity & NFS_INO_INVALID_OTHER)) 312 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP); 313 } 314 315 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry, 316 struct nfs4_readdir_arg *readdir) 317 { 318 unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE; 319 __be32 *start, *p; 320 321 if (cookie > 2) { 322 readdir->cookie = cookie; 323 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); 324 return; 325 } 326 327 readdir->cookie = 0; 328 memset(&readdir->verifier, 0, sizeof(readdir->verifier)); 329 if (cookie == 2) 330 return; 331 332 /* 333 * NFSv4 servers do not return entries for '.' and '..' 334 * Therefore, we fake these entries here. We let '.' 335 * have cookie 0 and '..' have cookie 1. Note that 336 * when talking to the server, we always send cookie 0 337 * instead of 1 or 2. 338 */ 339 start = p = kmap_atomic(*readdir->pages); 340 341 if (cookie == 0) { 342 *p++ = xdr_one; /* next */ 343 *p++ = xdr_zero; /* cookie, first word */ 344 *p++ = xdr_one; /* cookie, second word */ 345 *p++ = xdr_one; /* entry len */ 346 memcpy(p, ".\0\0\0", 4); /* entry */ 347 p++; 348 *p++ = xdr_one; /* bitmap length */ 349 *p++ = htonl(attrs); /* bitmap */ 350 *p++ = htonl(12); /* attribute buffer length */ 351 *p++ = htonl(NF4DIR); 352 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry))); 353 } 354 355 *p++ = xdr_one; /* next */ 356 *p++ = xdr_zero; /* cookie, first word */ 357 *p++ = xdr_two; /* cookie, second word */ 358 *p++ = xdr_two; /* entry len */ 359 memcpy(p, "..\0\0", 4); /* entry */ 360 p++; 361 *p++ = xdr_one; /* bitmap length */ 362 *p++ = htonl(attrs); /* bitmap */ 363 *p++ = htonl(12); /* attribute buffer length */ 364 *p++ = htonl(NF4DIR); 365 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent))); 366 367 readdir->pgbase = (char *)p - (char *)start; 368 readdir->count -= readdir->pgbase; 369 kunmap_atomic(start); 370 } 371 372 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version) 373 { 374 if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) { 375 fattr->pre_change_attr = version; 376 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; 377 } 378 } 379 380 static void nfs4_test_and_free_stateid(struct nfs_server *server, 381 nfs4_stateid *stateid, 382 const struct cred *cred) 383 { 384 const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops; 385 386 ops->test_and_free_expired(server, stateid, cred); 387 } 388 389 static void __nfs4_free_revoked_stateid(struct nfs_server *server, 390 nfs4_stateid *stateid, 391 const struct cred *cred) 392 { 393 stateid->type = NFS4_REVOKED_STATEID_TYPE; 394 nfs4_test_and_free_stateid(server, stateid, cred); 395 } 396 397 static void nfs4_free_revoked_stateid(struct nfs_server *server, 398 const nfs4_stateid *stateid, 399 const struct cred *cred) 400 { 401 nfs4_stateid tmp; 402 403 nfs4_stateid_copy(&tmp, stateid); 404 __nfs4_free_revoked_stateid(server, &tmp, cred); 405 } 406 407 static long nfs4_update_delay(long *timeout) 408 { 409 long ret; 410 if (!timeout) 411 return NFS4_POLL_RETRY_MAX; 412 if (*timeout <= 0) 413 *timeout = NFS4_POLL_RETRY_MIN; 414 if (*timeout > NFS4_POLL_RETRY_MAX) 415 *timeout = NFS4_POLL_RETRY_MAX; 416 ret = *timeout; 417 *timeout <<= 1; 418 return ret; 419 } 420 421 static int nfs4_delay_killable(long *timeout) 422 { 423 might_sleep(); 424 425 __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 426 schedule_timeout(nfs4_update_delay(timeout)); 427 if (!__fatal_signal_pending(current)) 428 return 0; 429 return -EINTR; 430 } 431 432 static int nfs4_delay_interruptible(long *timeout) 433 { 434 might_sleep(); 435 436 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE); 437 schedule_timeout(nfs4_update_delay(timeout)); 438 if (!signal_pending(current)) 439 return 0; 440 return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS; 441 } 442 443 static int nfs4_delay(long *timeout, bool interruptible) 444 { 445 if (interruptible) 446 return nfs4_delay_interruptible(timeout); 447 return nfs4_delay_killable(timeout); 448 } 449 450 static const nfs4_stateid * 451 nfs4_recoverable_stateid(const nfs4_stateid *stateid) 452 { 453 if (!stateid) 454 return NULL; 455 switch (stateid->type) { 456 case NFS4_OPEN_STATEID_TYPE: 457 case NFS4_LOCK_STATEID_TYPE: 458 case NFS4_DELEGATION_STATEID_TYPE: 459 return stateid; 460 default: 461 break; 462 } 463 return NULL; 464 } 465 466 /* This is the error handling routine for processes that are allowed 467 * to sleep. 468 */ 469 static int nfs4_do_handle_exception(struct nfs_server *server, 470 int errorcode, struct nfs4_exception *exception) 471 { 472 struct nfs_client *clp = server->nfs_client; 473 struct nfs4_state *state = exception->state; 474 const nfs4_stateid *stateid; 475 struct inode *inode = exception->inode; 476 int ret = errorcode; 477 478 exception->delay = 0; 479 exception->recovering = 0; 480 exception->retry = 0; 481 482 stateid = nfs4_recoverable_stateid(exception->stateid); 483 if (stateid == NULL && state != NULL) 484 stateid = nfs4_recoverable_stateid(&state->stateid); 485 486 switch(errorcode) { 487 case 0: 488 return 0; 489 case -NFS4ERR_BADHANDLE: 490 case -ESTALE: 491 if (inode != NULL && S_ISREG(inode->i_mode)) 492 pnfs_destroy_layout(NFS_I(inode)); 493 break; 494 case -NFS4ERR_DELEG_REVOKED: 495 case -NFS4ERR_ADMIN_REVOKED: 496 case -NFS4ERR_EXPIRED: 497 case -NFS4ERR_BAD_STATEID: 498 case -NFS4ERR_PARTNER_NO_AUTH: 499 if (inode != NULL && stateid != NULL) { 500 nfs_inode_find_state_and_recover(inode, 501 stateid); 502 goto wait_on_recovery; 503 } 504 fallthrough; 505 case -NFS4ERR_OPENMODE: 506 if (inode) { 507 int err; 508 509 err = nfs_async_inode_return_delegation(inode, 510 stateid); 511 if (err == 0) 512 goto wait_on_recovery; 513 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) { 514 exception->retry = 1; 515 break; 516 } 517 } 518 if (state == NULL) 519 break; 520 ret = nfs4_schedule_stateid_recovery(server, state); 521 if (ret < 0) 522 break; 523 goto wait_on_recovery; 524 case -NFS4ERR_STALE_STATEID: 525 case -NFS4ERR_STALE_CLIENTID: 526 nfs4_schedule_lease_recovery(clp); 527 goto wait_on_recovery; 528 case -NFS4ERR_MOVED: 529 ret = nfs4_schedule_migration_recovery(server); 530 if (ret < 0) 531 break; 532 goto wait_on_recovery; 533 case -NFS4ERR_LEASE_MOVED: 534 nfs4_schedule_lease_moved_recovery(clp); 535 goto wait_on_recovery; 536 #if defined(CONFIG_NFS_V4_1) 537 case -NFS4ERR_BADSESSION: 538 case -NFS4ERR_BADSLOT: 539 case -NFS4ERR_BAD_HIGH_SLOT: 540 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 541 case -NFS4ERR_DEADSESSION: 542 case -NFS4ERR_SEQ_FALSE_RETRY: 543 case -NFS4ERR_SEQ_MISORDERED: 544 /* Handled in nfs41_sequence_process() */ 545 goto wait_on_recovery; 546 #endif /* defined(CONFIG_NFS_V4_1) */ 547 case -NFS4ERR_FILE_OPEN: 548 if (exception->timeout > HZ) { 549 /* We have retried a decent amount, time to 550 * fail 551 */ 552 ret = -EBUSY; 553 break; 554 } 555 fallthrough; 556 case -NFS4ERR_DELAY: 557 nfs_inc_server_stats(server, NFSIOS_DELAY); 558 fallthrough; 559 case -NFS4ERR_GRACE: 560 case -NFS4ERR_LAYOUTTRYLATER: 561 case -NFS4ERR_RECALLCONFLICT: 562 case -NFS4ERR_RETURNCONFLICT: 563 exception->delay = 1; 564 return 0; 565 566 case -NFS4ERR_RETRY_UNCACHED_REP: 567 case -NFS4ERR_OLD_STATEID: 568 exception->retry = 1; 569 break; 570 case -NFS4ERR_BADOWNER: 571 /* The following works around a Linux server bug! */ 572 case -NFS4ERR_BADNAME: 573 if (server->caps & NFS_CAP_UIDGID_NOMAP) { 574 server->caps &= ~NFS_CAP_UIDGID_NOMAP; 575 exception->retry = 1; 576 printk(KERN_WARNING "NFS: v4 server %s " 577 "does not accept raw " 578 "uid/gids. " 579 "Reenabling the idmapper.\n", 580 server->nfs_client->cl_hostname); 581 } 582 } 583 /* We failed to handle the error */ 584 return nfs4_map_errors(ret); 585 wait_on_recovery: 586 exception->recovering = 1; 587 return 0; 588 } 589 590 /* This is the error handling routine for processes that are allowed 591 * to sleep. 592 */ 593 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) 594 { 595 struct nfs_client *clp = server->nfs_client; 596 int ret; 597 598 ret = nfs4_do_handle_exception(server, errorcode, exception); 599 if (exception->delay) { 600 ret = nfs4_delay(&exception->timeout, 601 exception->interruptible); 602 goto out_retry; 603 } 604 if (exception->recovering) { 605 if (exception->task_is_privileged) 606 return -EDEADLOCK; 607 ret = nfs4_wait_clnt_recover(clp); 608 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 609 return -EIO; 610 goto out_retry; 611 } 612 return ret; 613 out_retry: 614 if (ret == 0) 615 exception->retry = 1; 616 return ret; 617 } 618 619 static int 620 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server, 621 int errorcode, struct nfs4_exception *exception) 622 { 623 struct nfs_client *clp = server->nfs_client; 624 int ret; 625 626 ret = nfs4_do_handle_exception(server, errorcode, exception); 627 if (exception->delay) { 628 rpc_delay(task, nfs4_update_delay(&exception->timeout)); 629 goto out_retry; 630 } 631 if (exception->recovering) { 632 if (exception->task_is_privileged) 633 return -EDEADLOCK; 634 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL); 635 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0) 636 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task); 637 goto out_retry; 638 } 639 if (test_bit(NFS_MIG_FAILED, &server->mig_status)) 640 ret = -EIO; 641 return ret; 642 out_retry: 643 if (ret == 0) { 644 exception->retry = 1; 645 /* 646 * For NFS4ERR_MOVED, the client transport will need to 647 * be recomputed after migration recovery has completed. 648 */ 649 if (errorcode == -NFS4ERR_MOVED) 650 rpc_task_release_transport(task); 651 } 652 return ret; 653 } 654 655 int 656 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server, 657 struct nfs4_state *state, long *timeout) 658 { 659 struct nfs4_exception exception = { 660 .state = state, 661 }; 662 663 if (task->tk_status >= 0) 664 return 0; 665 if (timeout) 666 exception.timeout = *timeout; 667 task->tk_status = nfs4_async_handle_exception(task, server, 668 task->tk_status, 669 &exception); 670 if (exception.delay && timeout) 671 *timeout = exception.timeout; 672 if (exception.retry) 673 return -EAGAIN; 674 return 0; 675 } 676 677 /* 678 * Return 'true' if 'clp' is using an rpc_client that is integrity protected 679 * or 'false' otherwise. 680 */ 681 static bool _nfs4_is_integrity_protected(struct nfs_client *clp) 682 { 683 rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor; 684 return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P); 685 } 686 687 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp) 688 { 689 spin_lock(&clp->cl_lock); 690 if (time_before(clp->cl_last_renewal,timestamp)) 691 clp->cl_last_renewal = timestamp; 692 spin_unlock(&clp->cl_lock); 693 } 694 695 static void renew_lease(const struct nfs_server *server, unsigned long timestamp) 696 { 697 struct nfs_client *clp = server->nfs_client; 698 699 if (!nfs4_has_session(clp)) 700 do_renew_lease(clp, timestamp); 701 } 702 703 struct nfs4_call_sync_data { 704 const struct nfs_server *seq_server; 705 struct nfs4_sequence_args *seq_args; 706 struct nfs4_sequence_res *seq_res; 707 }; 708 709 void nfs4_init_sequence(struct nfs4_sequence_args *args, 710 struct nfs4_sequence_res *res, int cache_reply, 711 int privileged) 712 { 713 args->sa_slot = NULL; 714 args->sa_cache_this = cache_reply; 715 args->sa_privileged = privileged; 716 717 res->sr_slot = NULL; 718 } 719 720 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res) 721 { 722 struct nfs4_slot *slot = res->sr_slot; 723 struct nfs4_slot_table *tbl; 724 725 tbl = slot->table; 726 spin_lock(&tbl->slot_tbl_lock); 727 if (!nfs41_wake_and_assign_slot(tbl, slot)) 728 nfs4_free_slot(tbl, slot); 729 spin_unlock(&tbl->slot_tbl_lock); 730 731 res->sr_slot = NULL; 732 } 733 734 static int nfs40_sequence_done(struct rpc_task *task, 735 struct nfs4_sequence_res *res) 736 { 737 if (res->sr_slot != NULL) 738 nfs40_sequence_free_slot(res); 739 return 1; 740 } 741 742 #if defined(CONFIG_NFS_V4_1) 743 744 static void nfs41_release_slot(struct nfs4_slot *slot) 745 { 746 struct nfs4_session *session; 747 struct nfs4_slot_table *tbl; 748 bool send_new_highest_used_slotid = false; 749 750 if (!slot) 751 return; 752 tbl = slot->table; 753 session = tbl->session; 754 755 /* Bump the slot sequence number */ 756 if (slot->seq_done) 757 slot->seq_nr++; 758 slot->seq_done = 0; 759 760 spin_lock(&tbl->slot_tbl_lock); 761 /* Be nice to the server: try to ensure that the last transmitted 762 * value for highest_user_slotid <= target_highest_slotid 763 */ 764 if (tbl->highest_used_slotid > tbl->target_highest_slotid) 765 send_new_highest_used_slotid = true; 766 767 if (nfs41_wake_and_assign_slot(tbl, slot)) { 768 send_new_highest_used_slotid = false; 769 goto out_unlock; 770 } 771 nfs4_free_slot(tbl, slot); 772 773 if (tbl->highest_used_slotid != NFS4_NO_SLOT) 774 send_new_highest_used_slotid = false; 775 out_unlock: 776 spin_unlock(&tbl->slot_tbl_lock); 777 if (send_new_highest_used_slotid) 778 nfs41_notify_server(session->clp); 779 if (waitqueue_active(&tbl->slot_waitq)) 780 wake_up_all(&tbl->slot_waitq); 781 } 782 783 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res) 784 { 785 nfs41_release_slot(res->sr_slot); 786 res->sr_slot = NULL; 787 } 788 789 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot, 790 u32 seqnr) 791 { 792 if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0) 793 slot->seq_nr_highest_sent = seqnr; 794 } 795 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr) 796 { 797 nfs4_slot_sequence_record_sent(slot, seqnr); 798 slot->seq_nr_last_acked = seqnr; 799 } 800 801 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred, 802 struct nfs4_slot *slot) 803 { 804 struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true); 805 if (!IS_ERR(task)) 806 rpc_put_task_async(task); 807 } 808 809 static int nfs41_sequence_process(struct rpc_task *task, 810 struct nfs4_sequence_res *res) 811 { 812 struct nfs4_session *session; 813 struct nfs4_slot *slot = res->sr_slot; 814 struct nfs_client *clp; 815 int status; 816 int ret = 1; 817 818 if (slot == NULL) 819 goto out_noaction; 820 /* don't increment the sequence number if the task wasn't sent */ 821 if (!RPC_WAS_SENT(task) || slot->seq_done) 822 goto out; 823 824 session = slot->table->session; 825 clp = session->clp; 826 827 trace_nfs4_sequence_done(session, res); 828 829 status = res->sr_status; 830 if (task->tk_status == -NFS4ERR_DEADSESSION) 831 status = -NFS4ERR_DEADSESSION; 832 833 /* Check the SEQUENCE operation status */ 834 switch (status) { 835 case 0: 836 /* Mark this sequence number as having been acked */ 837 nfs4_slot_sequence_acked(slot, slot->seq_nr); 838 /* Update the slot's sequence and clientid lease timer */ 839 slot->seq_done = 1; 840 do_renew_lease(clp, res->sr_timestamp); 841 /* Check sequence flags */ 842 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags, 843 !!slot->privileged); 844 nfs41_update_target_slotid(slot->table, slot, res); 845 break; 846 case 1: 847 /* 848 * sr_status remains 1 if an RPC level error occurred. 849 * The server may or may not have processed the sequence 850 * operation.. 851 */ 852 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 853 slot->seq_done = 1; 854 goto out; 855 case -NFS4ERR_DELAY: 856 /* The server detected a resend of the RPC call and 857 * returned NFS4ERR_DELAY as per Section 2.10.6.2 858 * of RFC5661. 859 */ 860 dprintk("%s: slot=%u seq=%u: Operation in progress\n", 861 __func__, 862 slot->slot_nr, 863 slot->seq_nr); 864 goto out_retry; 865 case -NFS4ERR_RETRY_UNCACHED_REP: 866 case -NFS4ERR_SEQ_FALSE_RETRY: 867 /* 868 * The server thinks we tried to replay a request. 869 * Retry the call after bumping the sequence ID. 870 */ 871 nfs4_slot_sequence_acked(slot, slot->seq_nr); 872 goto retry_new_seq; 873 case -NFS4ERR_BADSLOT: 874 /* 875 * The slot id we used was probably retired. Try again 876 * using a different slot id. 877 */ 878 if (slot->slot_nr < slot->table->target_highest_slotid) 879 goto session_recover; 880 goto retry_nowait; 881 case -NFS4ERR_SEQ_MISORDERED: 882 nfs4_slot_sequence_record_sent(slot, slot->seq_nr); 883 /* 884 * Were one or more calls using this slot interrupted? 885 * If the server never received the request, then our 886 * transmitted slot sequence number may be too high. However, 887 * if the server did receive the request then it might 888 * accidentally give us a reply with a mismatched operation. 889 * We can sort this out by sending a lone sequence operation 890 * to the server on the same slot. 891 */ 892 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) { 893 slot->seq_nr--; 894 if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) { 895 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot); 896 res->sr_slot = NULL; 897 } 898 goto retry_nowait; 899 } 900 /* 901 * RFC5661: 902 * A retry might be sent while the original request is 903 * still in progress on the replier. The replier SHOULD 904 * deal with the issue by returning NFS4ERR_DELAY as the 905 * reply to SEQUENCE or CB_SEQUENCE operation, but 906 * implementations MAY return NFS4ERR_SEQ_MISORDERED. 907 * 908 * Restart the search after a delay. 909 */ 910 slot->seq_nr = slot->seq_nr_highest_sent; 911 goto out_retry; 912 case -NFS4ERR_BADSESSION: 913 case -NFS4ERR_DEADSESSION: 914 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 915 goto session_recover; 916 default: 917 /* Just update the slot sequence no. */ 918 slot->seq_done = 1; 919 } 920 out: 921 /* The session may be reset by one of the error handlers. */ 922 dprintk("%s: Error %d free the slot \n", __func__, res->sr_status); 923 out_noaction: 924 return ret; 925 session_recover: 926 set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state); 927 nfs4_schedule_session_recovery(session, status); 928 dprintk("%s ERROR: %d Reset session\n", __func__, status); 929 nfs41_sequence_free_slot(res); 930 goto out; 931 retry_new_seq: 932 ++slot->seq_nr; 933 retry_nowait: 934 if (rpc_restart_call_prepare(task)) { 935 nfs41_sequence_free_slot(res); 936 task->tk_status = 0; 937 ret = 0; 938 } 939 goto out; 940 out_retry: 941 if (!rpc_restart_call(task)) 942 goto out; 943 rpc_delay(task, NFS4_POLL_RETRY_MAX); 944 return 0; 945 } 946 947 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 948 { 949 if (!nfs41_sequence_process(task, res)) 950 return 0; 951 if (res->sr_slot != NULL) 952 nfs41_sequence_free_slot(res); 953 return 1; 954 955 } 956 EXPORT_SYMBOL_GPL(nfs41_sequence_done); 957 958 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 959 { 960 if (res->sr_slot == NULL) 961 return 1; 962 if (res->sr_slot->table->session != NULL) 963 return nfs41_sequence_process(task, res); 964 return nfs40_sequence_done(task, res); 965 } 966 967 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 968 { 969 if (res->sr_slot != NULL) { 970 if (res->sr_slot->table->session != NULL) 971 nfs41_sequence_free_slot(res); 972 else 973 nfs40_sequence_free_slot(res); 974 } 975 } 976 977 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res) 978 { 979 if (res->sr_slot == NULL) 980 return 1; 981 if (!res->sr_slot->table->session) 982 return nfs40_sequence_done(task, res); 983 return nfs41_sequence_done(task, res); 984 } 985 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 986 987 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata) 988 { 989 struct nfs4_call_sync_data *data = calldata; 990 991 dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server); 992 993 nfs4_setup_sequence(data->seq_server->nfs_client, 994 data->seq_args, data->seq_res, task); 995 } 996 997 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata) 998 { 999 struct nfs4_call_sync_data *data = calldata; 1000 1001 nfs41_sequence_done(task, data->seq_res); 1002 } 1003 1004 static const struct rpc_call_ops nfs41_call_sync_ops = { 1005 .rpc_call_prepare = nfs41_call_sync_prepare, 1006 .rpc_call_done = nfs41_call_sync_done, 1007 }; 1008 1009 #else /* !CONFIG_NFS_V4_1 */ 1010 1011 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res) 1012 { 1013 return nfs40_sequence_done(task, res); 1014 } 1015 1016 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res) 1017 { 1018 if (res->sr_slot != NULL) 1019 nfs40_sequence_free_slot(res); 1020 } 1021 1022 int nfs4_sequence_done(struct rpc_task *task, 1023 struct nfs4_sequence_res *res) 1024 { 1025 return nfs40_sequence_done(task, res); 1026 } 1027 EXPORT_SYMBOL_GPL(nfs4_sequence_done); 1028 1029 #endif /* !CONFIG_NFS_V4_1 */ 1030 1031 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res) 1032 { 1033 res->sr_timestamp = jiffies; 1034 res->sr_status_flags = 0; 1035 res->sr_status = 1; 1036 } 1037 1038 static 1039 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args, 1040 struct nfs4_sequence_res *res, 1041 struct nfs4_slot *slot) 1042 { 1043 if (!slot) 1044 return; 1045 slot->privileged = args->sa_privileged ? 1 : 0; 1046 args->sa_slot = slot; 1047 1048 res->sr_slot = slot; 1049 } 1050 1051 int nfs4_setup_sequence(struct nfs_client *client, 1052 struct nfs4_sequence_args *args, 1053 struct nfs4_sequence_res *res, 1054 struct rpc_task *task) 1055 { 1056 struct nfs4_session *session = nfs4_get_session(client); 1057 struct nfs4_slot_table *tbl = client->cl_slot_tbl; 1058 struct nfs4_slot *slot; 1059 1060 /* slot already allocated? */ 1061 if (res->sr_slot != NULL) 1062 goto out_start; 1063 1064 if (session) 1065 tbl = &session->fc_slot_table; 1066 1067 spin_lock(&tbl->slot_tbl_lock); 1068 /* The state manager will wait until the slot table is empty */ 1069 if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged) 1070 goto out_sleep; 1071 1072 slot = nfs4_alloc_slot(tbl); 1073 if (IS_ERR(slot)) { 1074 if (slot == ERR_PTR(-ENOMEM)) 1075 goto out_sleep_timeout; 1076 goto out_sleep; 1077 } 1078 spin_unlock(&tbl->slot_tbl_lock); 1079 1080 nfs4_sequence_attach_slot(args, res, slot); 1081 1082 trace_nfs4_setup_sequence(session, args); 1083 out_start: 1084 nfs41_sequence_res_init(res); 1085 rpc_call_start(task); 1086 return 0; 1087 out_sleep_timeout: 1088 /* Try again in 1/4 second */ 1089 if (args->sa_privileged) 1090 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task, 1091 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED); 1092 else 1093 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task, 1094 NULL, jiffies + (HZ >> 2)); 1095 spin_unlock(&tbl->slot_tbl_lock); 1096 return -EAGAIN; 1097 out_sleep: 1098 if (args->sa_privileged) 1099 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task, 1100 RPC_PRIORITY_PRIVILEGED); 1101 else 1102 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL); 1103 spin_unlock(&tbl->slot_tbl_lock); 1104 return -EAGAIN; 1105 } 1106 EXPORT_SYMBOL_GPL(nfs4_setup_sequence); 1107 1108 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata) 1109 { 1110 struct nfs4_call_sync_data *data = calldata; 1111 nfs4_setup_sequence(data->seq_server->nfs_client, 1112 data->seq_args, data->seq_res, task); 1113 } 1114 1115 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata) 1116 { 1117 struct nfs4_call_sync_data *data = calldata; 1118 nfs4_sequence_done(task, data->seq_res); 1119 } 1120 1121 static const struct rpc_call_ops nfs40_call_sync_ops = { 1122 .rpc_call_prepare = nfs40_call_sync_prepare, 1123 .rpc_call_done = nfs40_call_sync_done, 1124 }; 1125 1126 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup) 1127 { 1128 int ret; 1129 struct rpc_task *task; 1130 1131 task = rpc_run_task(task_setup); 1132 if (IS_ERR(task)) 1133 return PTR_ERR(task); 1134 1135 ret = task->tk_status; 1136 rpc_put_task(task); 1137 return ret; 1138 } 1139 1140 static int nfs4_do_call_sync(struct rpc_clnt *clnt, 1141 struct nfs_server *server, 1142 struct rpc_message *msg, 1143 struct nfs4_sequence_args *args, 1144 struct nfs4_sequence_res *res, 1145 unsigned short task_flags) 1146 { 1147 struct nfs_client *clp = server->nfs_client; 1148 struct nfs4_call_sync_data data = { 1149 .seq_server = server, 1150 .seq_args = args, 1151 .seq_res = res, 1152 }; 1153 struct rpc_task_setup task_setup = { 1154 .rpc_client = clnt, 1155 .rpc_message = msg, 1156 .callback_ops = clp->cl_mvops->call_sync_ops, 1157 .callback_data = &data, 1158 .flags = task_flags, 1159 }; 1160 1161 return nfs4_call_sync_custom(&task_setup); 1162 } 1163 1164 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, 1165 struct nfs_server *server, 1166 struct rpc_message *msg, 1167 struct nfs4_sequence_args *args, 1168 struct nfs4_sequence_res *res) 1169 { 1170 unsigned short task_flags = 0; 1171 1172 if (server->caps & NFS_CAP_MOVEABLE) 1173 task_flags = RPC_TASK_MOVEABLE; 1174 return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags); 1175 } 1176 1177 1178 int nfs4_call_sync(struct rpc_clnt *clnt, 1179 struct nfs_server *server, 1180 struct rpc_message *msg, 1181 struct nfs4_sequence_args *args, 1182 struct nfs4_sequence_res *res, 1183 int cache_reply) 1184 { 1185 nfs4_init_sequence(args, res, cache_reply, 0); 1186 return nfs4_call_sync_sequence(clnt, server, msg, args, res); 1187 } 1188 1189 static void 1190 nfs4_inc_nlink_locked(struct inode *inode) 1191 { 1192 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1193 NFS_INO_INVALID_CTIME | 1194 NFS_INO_INVALID_NLINK); 1195 inc_nlink(inode); 1196 } 1197 1198 static void 1199 nfs4_inc_nlink(struct inode *inode) 1200 { 1201 spin_lock(&inode->i_lock); 1202 nfs4_inc_nlink_locked(inode); 1203 spin_unlock(&inode->i_lock); 1204 } 1205 1206 static void 1207 nfs4_dec_nlink_locked(struct inode *inode) 1208 { 1209 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 1210 NFS_INO_INVALID_CTIME | 1211 NFS_INO_INVALID_NLINK); 1212 drop_nlink(inode); 1213 } 1214 1215 static void 1216 nfs4_update_changeattr_locked(struct inode *inode, 1217 struct nfs4_change_info *cinfo, 1218 unsigned long timestamp, unsigned long cache_validity) 1219 { 1220 struct nfs_inode *nfsi = NFS_I(inode); 1221 u64 change_attr = inode_peek_iversion_raw(inode); 1222 1223 cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME; 1224 if (S_ISDIR(inode->i_mode)) 1225 cache_validity |= NFS_INO_INVALID_DATA; 1226 1227 switch (NFS_SERVER(inode)->change_attr_type) { 1228 case NFS4_CHANGE_TYPE_IS_UNDEFINED: 1229 if (cinfo->after == change_attr) 1230 goto out; 1231 break; 1232 default: 1233 if ((s64)(change_attr - cinfo->after) >= 0) 1234 goto out; 1235 } 1236 1237 inode_set_iversion_raw(inode, cinfo->after); 1238 if (!cinfo->atomic || cinfo->before != change_attr) { 1239 if (S_ISDIR(inode->i_mode)) 1240 nfs_force_lookup_revalidate(inode); 1241 1242 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1243 cache_validity |= 1244 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL | 1245 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER | 1246 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK | 1247 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR; 1248 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); 1249 } 1250 nfsi->attrtimeo_timestamp = jiffies; 1251 nfsi->read_cache_jiffies = timestamp; 1252 nfsi->attr_gencount = nfs_inc_attr_generation_counter(); 1253 nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE; 1254 out: 1255 nfs_set_cache_invalid(inode, cache_validity); 1256 } 1257 1258 void 1259 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo, 1260 unsigned long timestamp, unsigned long cache_validity) 1261 { 1262 spin_lock(&dir->i_lock); 1263 nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity); 1264 spin_unlock(&dir->i_lock); 1265 } 1266 1267 struct nfs4_open_createattrs { 1268 struct nfs4_label *label; 1269 struct iattr *sattr; 1270 const __u32 verf[2]; 1271 }; 1272 1273 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server, 1274 int err, struct nfs4_exception *exception) 1275 { 1276 if (err != -EINVAL) 1277 return false; 1278 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1279 return false; 1280 server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1; 1281 exception->retry = 1; 1282 return true; 1283 } 1284 1285 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx) 1286 { 1287 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC); 1288 } 1289 1290 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx) 1291 { 1292 fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE); 1293 1294 return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret; 1295 } 1296 1297 static u32 1298 nfs4_map_atomic_open_share(struct nfs_server *server, 1299 fmode_t fmode, int openflags) 1300 { 1301 u32 res = 0; 1302 1303 switch (fmode & (FMODE_READ | FMODE_WRITE)) { 1304 case FMODE_READ: 1305 res = NFS4_SHARE_ACCESS_READ; 1306 break; 1307 case FMODE_WRITE: 1308 res = NFS4_SHARE_ACCESS_WRITE; 1309 break; 1310 case FMODE_READ|FMODE_WRITE: 1311 res = NFS4_SHARE_ACCESS_BOTH; 1312 } 1313 if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1)) 1314 goto out; 1315 /* Want no delegation if we're using O_DIRECT */ 1316 if (openflags & O_DIRECT) 1317 res |= NFS4_SHARE_WANT_NO_DELEG; 1318 out: 1319 return res; 1320 } 1321 1322 static enum open_claim_type4 1323 nfs4_map_atomic_open_claim(struct nfs_server *server, 1324 enum open_claim_type4 claim) 1325 { 1326 if (server->caps & NFS_CAP_ATOMIC_OPEN_V1) 1327 return claim; 1328 switch (claim) { 1329 default: 1330 return claim; 1331 case NFS4_OPEN_CLAIM_FH: 1332 return NFS4_OPEN_CLAIM_NULL; 1333 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1334 return NFS4_OPEN_CLAIM_DELEGATE_CUR; 1335 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1336 return NFS4_OPEN_CLAIM_DELEGATE_PREV; 1337 } 1338 } 1339 1340 static void nfs4_init_opendata_res(struct nfs4_opendata *p) 1341 { 1342 p->o_res.f_attr = &p->f_attr; 1343 p->o_res.seqid = p->o_arg.seqid; 1344 p->c_res.seqid = p->c_arg.seqid; 1345 p->o_res.server = p->o_arg.server; 1346 p->o_res.access_request = p->o_arg.access; 1347 nfs_fattr_init(&p->f_attr); 1348 nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name); 1349 } 1350 1351 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, 1352 struct nfs4_state_owner *sp, fmode_t fmode, int flags, 1353 const struct nfs4_open_createattrs *c, 1354 enum open_claim_type4 claim, 1355 gfp_t gfp_mask) 1356 { 1357 struct dentry *parent = dget_parent(dentry); 1358 struct inode *dir = d_inode(parent); 1359 struct nfs_server *server = NFS_SERVER(dir); 1360 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 1361 struct nfs4_label *label = (c != NULL) ? c->label : NULL; 1362 struct nfs4_opendata *p; 1363 1364 p = kzalloc(sizeof(*p), gfp_mask); 1365 if (p == NULL) 1366 goto err; 1367 1368 p->f_attr.label = nfs4_label_alloc(server, gfp_mask); 1369 if (IS_ERR(p->f_attr.label)) 1370 goto err_free_p; 1371 1372 p->a_label = nfs4_label_alloc(server, gfp_mask); 1373 if (IS_ERR(p->a_label)) 1374 goto err_free_f; 1375 1376 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 1377 p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask); 1378 if (IS_ERR(p->o_arg.seqid)) 1379 goto err_free_label; 1380 nfs_sb_active(dentry->d_sb); 1381 p->dentry = dget(dentry); 1382 p->dir = parent; 1383 p->owner = sp; 1384 atomic_inc(&sp->so_count); 1385 p->o_arg.open_flags = flags; 1386 p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE); 1387 p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim); 1388 p->o_arg.share_access = nfs4_map_atomic_open_share(server, 1389 fmode, flags); 1390 if (flags & O_CREAT) { 1391 p->o_arg.umask = current_umask(); 1392 p->o_arg.label = nfs4_label_copy(p->a_label, label); 1393 if (c->sattr != NULL && c->sattr->ia_valid != 0) { 1394 p->o_arg.u.attrs = &p->attrs; 1395 memcpy(&p->attrs, c->sattr, sizeof(p->attrs)); 1396 1397 memcpy(p->o_arg.u.verifier.data, c->verf, 1398 sizeof(p->o_arg.u.verifier.data)); 1399 } 1400 } 1401 /* ask server to check for all possible rights as results 1402 * are cached */ 1403 switch (p->o_arg.claim) { 1404 default: 1405 break; 1406 case NFS4_OPEN_CLAIM_NULL: 1407 case NFS4_OPEN_CLAIM_FH: 1408 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY | 1409 NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE | 1410 NFS4_ACCESS_EXECUTE | 1411 nfs_access_xattr_mask(server); 1412 } 1413 p->o_arg.clientid = server->nfs_client->cl_clientid; 1414 p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time); 1415 p->o_arg.id.uniquifier = sp->so_seqid.owner_id; 1416 p->o_arg.name = &dentry->d_name; 1417 p->o_arg.server = server; 1418 p->o_arg.bitmask = nfs4_bitmask(server, label); 1419 p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0]; 1420 switch (p->o_arg.claim) { 1421 case NFS4_OPEN_CLAIM_NULL: 1422 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1423 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 1424 p->o_arg.fh = NFS_FH(dir); 1425 break; 1426 case NFS4_OPEN_CLAIM_PREVIOUS: 1427 case NFS4_OPEN_CLAIM_FH: 1428 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1429 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 1430 p->o_arg.fh = NFS_FH(d_inode(dentry)); 1431 } 1432 p->c_arg.fh = &p->o_res.fh; 1433 p->c_arg.stateid = &p->o_res.stateid; 1434 p->c_arg.seqid = p->o_arg.seqid; 1435 nfs4_init_opendata_res(p); 1436 kref_init(&p->kref); 1437 return p; 1438 1439 err_free_label: 1440 nfs4_label_free(p->a_label); 1441 err_free_f: 1442 nfs4_label_free(p->f_attr.label); 1443 err_free_p: 1444 kfree(p); 1445 err: 1446 dput(parent); 1447 return NULL; 1448 } 1449 1450 static void nfs4_opendata_free(struct kref *kref) 1451 { 1452 struct nfs4_opendata *p = container_of(kref, 1453 struct nfs4_opendata, kref); 1454 struct super_block *sb = p->dentry->d_sb; 1455 1456 nfs4_lgopen_release(p->lgp); 1457 nfs_free_seqid(p->o_arg.seqid); 1458 nfs4_sequence_free_slot(&p->o_res.seq_res); 1459 if (p->state != NULL) 1460 nfs4_put_open_state(p->state); 1461 nfs4_put_state_owner(p->owner); 1462 1463 nfs4_label_free(p->a_label); 1464 nfs4_label_free(p->f_attr.label); 1465 1466 dput(p->dir); 1467 dput(p->dentry); 1468 nfs_sb_deactive(sb); 1469 nfs_fattr_free_names(&p->f_attr); 1470 kfree(p->f_attr.mdsthreshold); 1471 kfree(p); 1472 } 1473 1474 static void nfs4_opendata_put(struct nfs4_opendata *p) 1475 { 1476 if (p != NULL) 1477 kref_put(&p->kref, nfs4_opendata_free); 1478 } 1479 1480 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state, 1481 fmode_t fmode) 1482 { 1483 switch(fmode & (FMODE_READ|FMODE_WRITE)) { 1484 case FMODE_READ|FMODE_WRITE: 1485 return state->n_rdwr != 0; 1486 case FMODE_WRITE: 1487 return state->n_wronly != 0; 1488 case FMODE_READ: 1489 return state->n_rdonly != 0; 1490 } 1491 WARN_ON_ONCE(1); 1492 return false; 1493 } 1494 1495 static int can_open_cached(struct nfs4_state *state, fmode_t mode, 1496 int open_mode, enum open_claim_type4 claim) 1497 { 1498 int ret = 0; 1499 1500 if (open_mode & (O_EXCL|O_TRUNC)) 1501 goto out; 1502 switch (claim) { 1503 case NFS4_OPEN_CLAIM_NULL: 1504 case NFS4_OPEN_CLAIM_FH: 1505 goto out; 1506 default: 1507 break; 1508 } 1509 switch (mode & (FMODE_READ|FMODE_WRITE)) { 1510 case FMODE_READ: 1511 ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0 1512 && state->n_rdonly != 0; 1513 break; 1514 case FMODE_WRITE: 1515 ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0 1516 && state->n_wronly != 0; 1517 break; 1518 case FMODE_READ|FMODE_WRITE: 1519 ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0 1520 && state->n_rdwr != 0; 1521 } 1522 out: 1523 return ret; 1524 } 1525 1526 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode, 1527 enum open_claim_type4 claim) 1528 { 1529 if (delegation == NULL) 1530 return 0; 1531 if ((delegation->type & fmode) != fmode) 1532 return 0; 1533 switch (claim) { 1534 case NFS4_OPEN_CLAIM_NULL: 1535 case NFS4_OPEN_CLAIM_FH: 1536 break; 1537 case NFS4_OPEN_CLAIM_PREVIOUS: 1538 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags)) 1539 break; 1540 fallthrough; 1541 default: 1542 return 0; 1543 } 1544 nfs_mark_delegation_referenced(delegation); 1545 return 1; 1546 } 1547 1548 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode) 1549 { 1550 switch (fmode) { 1551 case FMODE_WRITE: 1552 state->n_wronly++; 1553 break; 1554 case FMODE_READ: 1555 state->n_rdonly++; 1556 break; 1557 case FMODE_READ|FMODE_WRITE: 1558 state->n_rdwr++; 1559 } 1560 nfs4_state_set_mode_locked(state, state->state | fmode); 1561 } 1562 1563 #ifdef CONFIG_NFS_V4_1 1564 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state) 1565 { 1566 if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags)) 1567 return true; 1568 if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags)) 1569 return true; 1570 if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags)) 1571 return true; 1572 return false; 1573 } 1574 #endif /* CONFIG_NFS_V4_1 */ 1575 1576 static void nfs_state_log_update_open_stateid(struct nfs4_state *state) 1577 { 1578 if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) 1579 wake_up_all(&state->waitq); 1580 } 1581 1582 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) 1583 { 1584 struct nfs_client *clp = state->owner->so_server->nfs_client; 1585 bool need_recover = false; 1586 1587 if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly) 1588 need_recover = true; 1589 if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly) 1590 need_recover = true; 1591 if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr) 1592 need_recover = true; 1593 if (need_recover) 1594 nfs4_state_mark_reclaim_nograce(clp, state); 1595 } 1596 1597 /* 1598 * Check for whether or not the caller may update the open stateid 1599 * to the value passed in by stateid. 1600 * 1601 * Note: This function relies heavily on the server implementing 1602 * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2 1603 * correctly. 1604 * i.e. The stateid seqids have to be initialised to 1, and 1605 * are then incremented on every state transition. 1606 */ 1607 static bool nfs_stateid_is_sequential(struct nfs4_state *state, 1608 const nfs4_stateid *stateid) 1609 { 1610 if (test_bit(NFS_OPEN_STATE, &state->flags)) { 1611 /* The common case - we're updating to a new sequence number */ 1612 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1613 if (nfs4_stateid_is_next(&state->open_stateid, stateid)) 1614 return true; 1615 return false; 1616 } 1617 /* The server returned a new stateid */ 1618 } 1619 /* This is the first OPEN in this generation */ 1620 if (stateid->seqid == cpu_to_be32(1)) 1621 return true; 1622 return false; 1623 } 1624 1625 static void nfs_resync_open_stateid_locked(struct nfs4_state *state) 1626 { 1627 if (!(state->n_wronly || state->n_rdonly || state->n_rdwr)) 1628 return; 1629 if (state->n_wronly) 1630 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1631 if (state->n_rdonly) 1632 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1633 if (state->n_rdwr) 1634 set_bit(NFS_O_RDWR_STATE, &state->flags); 1635 set_bit(NFS_OPEN_STATE, &state->flags); 1636 } 1637 1638 static void nfs_clear_open_stateid_locked(struct nfs4_state *state, 1639 nfs4_stateid *stateid, fmode_t fmode) 1640 { 1641 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1642 switch (fmode & (FMODE_READ|FMODE_WRITE)) { 1643 case FMODE_WRITE: 1644 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1645 break; 1646 case FMODE_READ: 1647 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1648 break; 1649 case 0: 1650 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1651 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1652 clear_bit(NFS_OPEN_STATE, &state->flags); 1653 } 1654 if (stateid == NULL) 1655 return; 1656 /* Handle OPEN+OPEN_DOWNGRADE races */ 1657 if (nfs4_stateid_match_other(stateid, &state->open_stateid) && 1658 !nfs4_stateid_is_newer(stateid, &state->open_stateid)) { 1659 nfs_resync_open_stateid_locked(state); 1660 goto out; 1661 } 1662 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1663 nfs4_stateid_copy(&state->stateid, stateid); 1664 nfs4_stateid_copy(&state->open_stateid, stateid); 1665 trace_nfs4_open_stateid_update(state->inode, stateid, 0); 1666 out: 1667 nfs_state_log_update_open_stateid(state); 1668 } 1669 1670 static void nfs_clear_open_stateid(struct nfs4_state *state, 1671 nfs4_stateid *arg_stateid, 1672 nfs4_stateid *stateid, fmode_t fmode) 1673 { 1674 write_seqlock(&state->seqlock); 1675 /* Ignore, if the CLOSE argment doesn't match the current stateid */ 1676 if (nfs4_state_match_open_stateid_other(state, arg_stateid)) 1677 nfs_clear_open_stateid_locked(state, stateid, fmode); 1678 write_sequnlock(&state->seqlock); 1679 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1680 nfs4_schedule_state_manager(state->owner->so_server->nfs_client); 1681 } 1682 1683 static void nfs_set_open_stateid_locked(struct nfs4_state *state, 1684 const nfs4_stateid *stateid, nfs4_stateid *freeme) 1685 __must_hold(&state->owner->so_lock) 1686 __must_hold(&state->seqlock) 1687 __must_hold(RCU) 1688 1689 { 1690 DEFINE_WAIT(wait); 1691 int status = 0; 1692 for (;;) { 1693 1694 if (nfs_stateid_is_sequential(state, stateid)) 1695 break; 1696 1697 if (status) 1698 break; 1699 /* Rely on seqids for serialisation with NFSv4.0 */ 1700 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) 1701 break; 1702 1703 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 1704 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 1705 /* 1706 * Ensure we process the state changes in the same order 1707 * in which the server processed them by delaying the 1708 * update of the stateid until we are in sequence. 1709 */ 1710 write_sequnlock(&state->seqlock); 1711 spin_unlock(&state->owner->so_lock); 1712 rcu_read_unlock(); 1713 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); 1714 1715 if (!fatal_signal_pending(current)) { 1716 if (schedule_timeout(5*HZ) == 0) 1717 status = -EAGAIN; 1718 else 1719 status = 0; 1720 } else 1721 status = -EINTR; 1722 finish_wait(&state->waitq, &wait); 1723 rcu_read_lock(); 1724 spin_lock(&state->owner->so_lock); 1725 write_seqlock(&state->seqlock); 1726 } 1727 1728 if (test_bit(NFS_OPEN_STATE, &state->flags) && 1729 !nfs4_stateid_match_other(stateid, &state->open_stateid)) { 1730 nfs4_stateid_copy(freeme, &state->open_stateid); 1731 nfs_test_and_clear_all_open_stateid(state); 1732 } 1733 1734 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 1735 nfs4_stateid_copy(&state->stateid, stateid); 1736 nfs4_stateid_copy(&state->open_stateid, stateid); 1737 trace_nfs4_open_stateid_update(state->inode, stateid, status); 1738 nfs_state_log_update_open_stateid(state); 1739 } 1740 1741 static void nfs_state_set_open_stateid(struct nfs4_state *state, 1742 const nfs4_stateid *open_stateid, 1743 fmode_t fmode, 1744 nfs4_stateid *freeme) 1745 { 1746 /* 1747 * Protect the call to nfs4_state_set_mode_locked and 1748 * serialise the stateid update 1749 */ 1750 write_seqlock(&state->seqlock); 1751 nfs_set_open_stateid_locked(state, open_stateid, freeme); 1752 switch (fmode) { 1753 case FMODE_READ: 1754 set_bit(NFS_O_RDONLY_STATE, &state->flags); 1755 break; 1756 case FMODE_WRITE: 1757 set_bit(NFS_O_WRONLY_STATE, &state->flags); 1758 break; 1759 case FMODE_READ|FMODE_WRITE: 1760 set_bit(NFS_O_RDWR_STATE, &state->flags); 1761 } 1762 set_bit(NFS_OPEN_STATE, &state->flags); 1763 write_sequnlock(&state->seqlock); 1764 } 1765 1766 static void nfs_state_clear_open_state_flags(struct nfs4_state *state) 1767 { 1768 clear_bit(NFS_O_RDWR_STATE, &state->flags); 1769 clear_bit(NFS_O_WRONLY_STATE, &state->flags); 1770 clear_bit(NFS_O_RDONLY_STATE, &state->flags); 1771 clear_bit(NFS_OPEN_STATE, &state->flags); 1772 } 1773 1774 static void nfs_state_set_delegation(struct nfs4_state *state, 1775 const nfs4_stateid *deleg_stateid, 1776 fmode_t fmode) 1777 { 1778 /* 1779 * Protect the call to nfs4_state_set_mode_locked and 1780 * serialise the stateid update 1781 */ 1782 write_seqlock(&state->seqlock); 1783 nfs4_stateid_copy(&state->stateid, deleg_stateid); 1784 set_bit(NFS_DELEGATED_STATE, &state->flags); 1785 write_sequnlock(&state->seqlock); 1786 } 1787 1788 static void nfs_state_clear_delegation(struct nfs4_state *state) 1789 { 1790 write_seqlock(&state->seqlock); 1791 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 1792 clear_bit(NFS_DELEGATED_STATE, &state->flags); 1793 write_sequnlock(&state->seqlock); 1794 } 1795 1796 int update_open_stateid(struct nfs4_state *state, 1797 const nfs4_stateid *open_stateid, 1798 const nfs4_stateid *delegation, 1799 fmode_t fmode) 1800 { 1801 struct nfs_server *server = NFS_SERVER(state->inode); 1802 struct nfs_client *clp = server->nfs_client; 1803 struct nfs_inode *nfsi = NFS_I(state->inode); 1804 struct nfs_delegation *deleg_cur; 1805 nfs4_stateid freeme = { }; 1806 int ret = 0; 1807 1808 fmode &= (FMODE_READ|FMODE_WRITE); 1809 1810 rcu_read_lock(); 1811 spin_lock(&state->owner->so_lock); 1812 if (open_stateid != NULL) { 1813 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme); 1814 ret = 1; 1815 } 1816 1817 deleg_cur = nfs4_get_valid_delegation(state->inode); 1818 if (deleg_cur == NULL) 1819 goto no_delegation; 1820 1821 spin_lock(&deleg_cur->lock); 1822 if (rcu_dereference(nfsi->delegation) != deleg_cur || 1823 test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) || 1824 (deleg_cur->type & fmode) != fmode) 1825 goto no_delegation_unlock; 1826 1827 if (delegation == NULL) 1828 delegation = &deleg_cur->stateid; 1829 else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation)) 1830 goto no_delegation_unlock; 1831 1832 nfs_mark_delegation_referenced(deleg_cur); 1833 nfs_state_set_delegation(state, &deleg_cur->stateid, fmode); 1834 ret = 1; 1835 no_delegation_unlock: 1836 spin_unlock(&deleg_cur->lock); 1837 no_delegation: 1838 if (ret) 1839 update_open_stateflags(state, fmode); 1840 spin_unlock(&state->owner->so_lock); 1841 rcu_read_unlock(); 1842 1843 if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) 1844 nfs4_schedule_state_manager(clp); 1845 if (freeme.type != 0) 1846 nfs4_test_and_free_stateid(server, &freeme, 1847 state->owner->so_cred); 1848 1849 return ret; 1850 } 1851 1852 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp, 1853 const nfs4_stateid *stateid) 1854 { 1855 struct nfs4_state *state = lsp->ls_state; 1856 bool ret = false; 1857 1858 spin_lock(&state->state_lock); 1859 if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid)) 1860 goto out_noupdate; 1861 if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid)) 1862 goto out_noupdate; 1863 nfs4_stateid_copy(&lsp->ls_stateid, stateid); 1864 ret = true; 1865 out_noupdate: 1866 spin_unlock(&state->state_lock); 1867 return ret; 1868 } 1869 1870 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode) 1871 { 1872 struct nfs_delegation *delegation; 1873 1874 fmode &= FMODE_READ|FMODE_WRITE; 1875 rcu_read_lock(); 1876 delegation = nfs4_get_valid_delegation(inode); 1877 if (delegation == NULL || (delegation->type & fmode) == fmode) { 1878 rcu_read_unlock(); 1879 return; 1880 } 1881 rcu_read_unlock(); 1882 nfs4_inode_return_delegation(inode); 1883 } 1884 1885 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata) 1886 { 1887 struct nfs4_state *state = opendata->state; 1888 struct nfs_delegation *delegation; 1889 int open_mode = opendata->o_arg.open_flags; 1890 fmode_t fmode = opendata->o_arg.fmode; 1891 enum open_claim_type4 claim = opendata->o_arg.claim; 1892 nfs4_stateid stateid; 1893 int ret = -EAGAIN; 1894 1895 for (;;) { 1896 spin_lock(&state->owner->so_lock); 1897 if (can_open_cached(state, fmode, open_mode, claim)) { 1898 update_open_stateflags(state, fmode); 1899 spin_unlock(&state->owner->so_lock); 1900 goto out_return_state; 1901 } 1902 spin_unlock(&state->owner->so_lock); 1903 rcu_read_lock(); 1904 delegation = nfs4_get_valid_delegation(state->inode); 1905 if (!can_open_delegated(delegation, fmode, claim)) { 1906 rcu_read_unlock(); 1907 break; 1908 } 1909 /* Save the delegation */ 1910 nfs4_stateid_copy(&stateid, &delegation->stateid); 1911 rcu_read_unlock(); 1912 nfs_release_seqid(opendata->o_arg.seqid); 1913 if (!opendata->is_recover) { 1914 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode); 1915 if (ret != 0) 1916 goto out; 1917 } 1918 ret = -EAGAIN; 1919 1920 /* Try to update the stateid using the delegation */ 1921 if (update_open_stateid(state, NULL, &stateid, fmode)) 1922 goto out_return_state; 1923 } 1924 out: 1925 return ERR_PTR(ret); 1926 out_return_state: 1927 refcount_inc(&state->count); 1928 return state; 1929 } 1930 1931 static void 1932 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state) 1933 { 1934 struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client; 1935 struct nfs_delegation *delegation; 1936 int delegation_flags = 0; 1937 1938 rcu_read_lock(); 1939 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 1940 if (delegation) 1941 delegation_flags = delegation->flags; 1942 rcu_read_unlock(); 1943 switch (data->o_arg.claim) { 1944 default: 1945 break; 1946 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 1947 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 1948 pr_err_ratelimited("NFS: Broken NFSv4 server %s is " 1949 "returning a delegation for " 1950 "OPEN(CLAIM_DELEGATE_CUR)\n", 1951 clp->cl_hostname); 1952 return; 1953 } 1954 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0) 1955 nfs_inode_set_delegation(state->inode, 1956 data->owner->so_cred, 1957 data->o_res.delegation_type, 1958 &data->o_res.delegation, 1959 data->o_res.pagemod_limit); 1960 else 1961 nfs_inode_reclaim_delegation(state->inode, 1962 data->owner->so_cred, 1963 data->o_res.delegation_type, 1964 &data->o_res.delegation, 1965 data->o_res.pagemod_limit); 1966 1967 if (data->o_res.do_recall) 1968 nfs_async_inode_return_delegation(state->inode, 1969 &data->o_res.delegation); 1970 } 1971 1972 /* 1973 * Check the inode attributes against the CLAIM_PREVIOUS returned attributes 1974 * and update the nfs4_state. 1975 */ 1976 static struct nfs4_state * 1977 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data) 1978 { 1979 struct inode *inode = data->state->inode; 1980 struct nfs4_state *state = data->state; 1981 int ret; 1982 1983 if (!data->rpc_done) { 1984 if (data->rpc_status) 1985 return ERR_PTR(data->rpc_status); 1986 return nfs4_try_open_cached(data); 1987 } 1988 1989 ret = nfs_refresh_inode(inode, &data->f_attr); 1990 if (ret) 1991 return ERR_PTR(ret); 1992 1993 if (data->o_res.delegation_type != 0) 1994 nfs4_opendata_check_deleg(data, state); 1995 1996 if (!update_open_stateid(state, &data->o_res.stateid, 1997 NULL, data->o_arg.fmode)) 1998 return ERR_PTR(-EAGAIN); 1999 refcount_inc(&state->count); 2000 2001 return state; 2002 } 2003 2004 static struct inode * 2005 nfs4_opendata_get_inode(struct nfs4_opendata *data) 2006 { 2007 struct inode *inode; 2008 2009 switch (data->o_arg.claim) { 2010 case NFS4_OPEN_CLAIM_NULL: 2011 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 2012 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 2013 if (!(data->f_attr.valid & NFS_ATTR_FATTR)) 2014 return ERR_PTR(-EAGAIN); 2015 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, 2016 &data->f_attr); 2017 break; 2018 default: 2019 inode = d_inode(data->dentry); 2020 ihold(inode); 2021 nfs_refresh_inode(inode, &data->f_attr); 2022 } 2023 return inode; 2024 } 2025 2026 static struct nfs4_state * 2027 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data) 2028 { 2029 struct nfs4_state *state; 2030 struct inode *inode; 2031 2032 inode = nfs4_opendata_get_inode(data); 2033 if (IS_ERR(inode)) 2034 return ERR_CAST(inode); 2035 if (data->state != NULL && data->state->inode == inode) { 2036 state = data->state; 2037 refcount_inc(&state->count); 2038 } else 2039 state = nfs4_get_open_state(inode, data->owner); 2040 iput(inode); 2041 if (state == NULL) 2042 state = ERR_PTR(-ENOMEM); 2043 return state; 2044 } 2045 2046 static struct nfs4_state * 2047 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2048 { 2049 struct nfs4_state *state; 2050 2051 if (!data->rpc_done) { 2052 state = nfs4_try_open_cached(data); 2053 trace_nfs4_cached_open(data->state); 2054 goto out; 2055 } 2056 2057 state = nfs4_opendata_find_nfs4_state(data); 2058 if (IS_ERR(state)) 2059 goto out; 2060 2061 if (data->o_res.delegation_type != 0) 2062 nfs4_opendata_check_deleg(data, state); 2063 if (!update_open_stateid(state, &data->o_res.stateid, 2064 NULL, data->o_arg.fmode)) { 2065 nfs4_put_open_state(state); 2066 state = ERR_PTR(-EAGAIN); 2067 } 2068 out: 2069 nfs_release_seqid(data->o_arg.seqid); 2070 return state; 2071 } 2072 2073 static struct nfs4_state * 2074 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) 2075 { 2076 struct nfs4_state *ret; 2077 2078 if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) 2079 ret =_nfs4_opendata_reclaim_to_nfs4_state(data); 2080 else 2081 ret = _nfs4_opendata_to_nfs4_state(data); 2082 nfs4_sequence_free_slot(&data->o_res.seq_res); 2083 return ret; 2084 } 2085 2086 static struct nfs_open_context * 2087 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode) 2088 { 2089 struct nfs_inode *nfsi = NFS_I(state->inode); 2090 struct nfs_open_context *ctx; 2091 2092 rcu_read_lock(); 2093 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 2094 if (ctx->state != state) 2095 continue; 2096 if ((ctx->mode & mode) != mode) 2097 continue; 2098 if (!get_nfs_open_context(ctx)) 2099 continue; 2100 rcu_read_unlock(); 2101 return ctx; 2102 } 2103 rcu_read_unlock(); 2104 return ERR_PTR(-ENOENT); 2105 } 2106 2107 static struct nfs_open_context * 2108 nfs4_state_find_open_context(struct nfs4_state *state) 2109 { 2110 struct nfs_open_context *ctx; 2111 2112 ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE); 2113 if (!IS_ERR(ctx)) 2114 return ctx; 2115 ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE); 2116 if (!IS_ERR(ctx)) 2117 return ctx; 2118 return nfs4_state_find_open_context_mode(state, FMODE_READ); 2119 } 2120 2121 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, 2122 struct nfs4_state *state, enum open_claim_type4 claim) 2123 { 2124 struct nfs4_opendata *opendata; 2125 2126 opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, 2127 NULL, claim, GFP_NOFS); 2128 if (opendata == NULL) 2129 return ERR_PTR(-ENOMEM); 2130 opendata->state = state; 2131 refcount_inc(&state->count); 2132 return opendata; 2133 } 2134 2135 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, 2136 fmode_t fmode) 2137 { 2138 struct nfs4_state *newstate; 2139 struct nfs_server *server = NFS_SB(opendata->dentry->d_sb); 2140 int openflags = opendata->o_arg.open_flags; 2141 int ret; 2142 2143 if (!nfs4_mode_match_open_stateid(opendata->state, fmode)) 2144 return 0; 2145 opendata->o_arg.fmode = fmode; 2146 opendata->o_arg.share_access = 2147 nfs4_map_atomic_open_share(server, fmode, openflags); 2148 memset(&opendata->o_res, 0, sizeof(opendata->o_res)); 2149 memset(&opendata->c_res, 0, sizeof(opendata->c_res)); 2150 nfs4_init_opendata_res(opendata); 2151 ret = _nfs4_recover_proc_open(opendata); 2152 if (ret != 0) 2153 return ret; 2154 newstate = nfs4_opendata_to_nfs4_state(opendata); 2155 if (IS_ERR(newstate)) 2156 return PTR_ERR(newstate); 2157 if (newstate != opendata->state) 2158 ret = -ESTALE; 2159 nfs4_close_state(newstate, fmode); 2160 return ret; 2161 } 2162 2163 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) 2164 { 2165 int ret; 2166 2167 /* memory barrier prior to reading state->n_* */ 2168 smp_rmb(); 2169 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2170 if (ret != 0) 2171 return ret; 2172 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2173 if (ret != 0) 2174 return ret; 2175 ret = nfs4_open_recover_helper(opendata, FMODE_READ); 2176 if (ret != 0) 2177 return ret; 2178 /* 2179 * We may have performed cached opens for all three recoveries. 2180 * Check if we need to update the current stateid. 2181 */ 2182 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 && 2183 !nfs4_stateid_match(&state->stateid, &state->open_stateid)) { 2184 write_seqlock(&state->seqlock); 2185 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0) 2186 nfs4_stateid_copy(&state->stateid, &state->open_stateid); 2187 write_sequnlock(&state->seqlock); 2188 } 2189 return 0; 2190 } 2191 2192 /* 2193 * OPEN_RECLAIM: 2194 * reclaim state on the server after a reboot. 2195 */ 2196 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2197 { 2198 struct nfs_delegation *delegation; 2199 struct nfs4_opendata *opendata; 2200 fmode_t delegation_type = 0; 2201 int status; 2202 2203 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2204 NFS4_OPEN_CLAIM_PREVIOUS); 2205 if (IS_ERR(opendata)) 2206 return PTR_ERR(opendata); 2207 rcu_read_lock(); 2208 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2209 if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0) 2210 delegation_type = delegation->type; 2211 rcu_read_unlock(); 2212 opendata->o_arg.u.delegation_type = delegation_type; 2213 status = nfs4_open_recover(opendata, state); 2214 nfs4_opendata_put(opendata); 2215 return status; 2216 } 2217 2218 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state) 2219 { 2220 struct nfs_server *server = NFS_SERVER(state->inode); 2221 struct nfs4_exception exception = { }; 2222 int err; 2223 do { 2224 err = _nfs4_do_open_reclaim(ctx, state); 2225 trace_nfs4_open_reclaim(ctx, 0, err); 2226 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2227 continue; 2228 if (err != -NFS4ERR_DELAY) 2229 break; 2230 nfs4_handle_exception(server, err, &exception); 2231 } while (exception.retry); 2232 return err; 2233 } 2234 2235 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) 2236 { 2237 struct nfs_open_context *ctx; 2238 int ret; 2239 2240 ctx = nfs4_state_find_open_context(state); 2241 if (IS_ERR(ctx)) 2242 return -EAGAIN; 2243 clear_bit(NFS_DELEGATED_STATE, &state->flags); 2244 nfs_state_clear_open_state_flags(state); 2245 ret = nfs4_do_open_reclaim(ctx, state); 2246 put_nfs_open_context(ctx); 2247 return ret; 2248 } 2249 2250 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err) 2251 { 2252 switch (err) { 2253 default: 2254 printk(KERN_ERR "NFS: %s: unhandled error " 2255 "%d.\n", __func__, err); 2256 fallthrough; 2257 case 0: 2258 case -ENOENT: 2259 case -EAGAIN: 2260 case -ESTALE: 2261 case -ETIMEDOUT: 2262 break; 2263 case -NFS4ERR_BADSESSION: 2264 case -NFS4ERR_BADSLOT: 2265 case -NFS4ERR_BAD_HIGH_SLOT: 2266 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 2267 case -NFS4ERR_DEADSESSION: 2268 return -EAGAIN; 2269 case -NFS4ERR_STALE_CLIENTID: 2270 case -NFS4ERR_STALE_STATEID: 2271 /* Don't recall a delegation if it was lost */ 2272 nfs4_schedule_lease_recovery(server->nfs_client); 2273 return -EAGAIN; 2274 case -NFS4ERR_MOVED: 2275 nfs4_schedule_migration_recovery(server); 2276 return -EAGAIN; 2277 case -NFS4ERR_LEASE_MOVED: 2278 nfs4_schedule_lease_moved_recovery(server->nfs_client); 2279 return -EAGAIN; 2280 case -NFS4ERR_DELEG_REVOKED: 2281 case -NFS4ERR_ADMIN_REVOKED: 2282 case -NFS4ERR_EXPIRED: 2283 case -NFS4ERR_BAD_STATEID: 2284 case -NFS4ERR_OPENMODE: 2285 nfs_inode_find_state_and_recover(state->inode, 2286 stateid); 2287 nfs4_schedule_stateid_recovery(server, state); 2288 return -EAGAIN; 2289 case -NFS4ERR_DELAY: 2290 case -NFS4ERR_GRACE: 2291 ssleep(1); 2292 return -EAGAIN; 2293 case -ENOMEM: 2294 case -NFS4ERR_DENIED: 2295 if (fl) { 2296 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner; 2297 if (lsp) 2298 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2299 } 2300 return 0; 2301 } 2302 return err; 2303 } 2304 2305 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, 2306 struct nfs4_state *state, const nfs4_stateid *stateid) 2307 { 2308 struct nfs_server *server = NFS_SERVER(state->inode); 2309 struct nfs4_opendata *opendata; 2310 int err = 0; 2311 2312 opendata = nfs4_open_recoverdata_alloc(ctx, state, 2313 NFS4_OPEN_CLAIM_DELEG_CUR_FH); 2314 if (IS_ERR(opendata)) 2315 return PTR_ERR(opendata); 2316 nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid); 2317 if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) { 2318 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE); 2319 if (err) 2320 goto out; 2321 } 2322 if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) { 2323 err = nfs4_open_recover_helper(opendata, FMODE_WRITE); 2324 if (err) 2325 goto out; 2326 } 2327 if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) { 2328 err = nfs4_open_recover_helper(opendata, FMODE_READ); 2329 if (err) 2330 goto out; 2331 } 2332 nfs_state_clear_delegation(state); 2333 out: 2334 nfs4_opendata_put(opendata); 2335 return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err); 2336 } 2337 2338 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) 2339 { 2340 struct nfs4_opendata *data = calldata; 2341 2342 nfs4_setup_sequence(data->o_arg.server->nfs_client, 2343 &data->c_arg.seq_args, &data->c_res.seq_res, task); 2344 } 2345 2346 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) 2347 { 2348 struct nfs4_opendata *data = calldata; 2349 2350 nfs40_sequence_done(task, &data->c_res.seq_res); 2351 2352 data->rpc_status = task->tk_status; 2353 if (data->rpc_status == 0) { 2354 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid); 2355 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2356 renew_lease(data->o_res.server, data->timestamp); 2357 data->rpc_done = true; 2358 } 2359 } 2360 2361 static void nfs4_open_confirm_release(void *calldata) 2362 { 2363 struct nfs4_opendata *data = calldata; 2364 struct nfs4_state *state = NULL; 2365 2366 /* If this request hasn't been cancelled, do nothing */ 2367 if (!data->cancelled) 2368 goto out_free; 2369 /* In case of error, no cleanup! */ 2370 if (!data->rpc_done) 2371 goto out_free; 2372 state = nfs4_opendata_to_nfs4_state(data); 2373 if (!IS_ERR(state)) 2374 nfs4_close_state(state, data->o_arg.fmode); 2375 out_free: 2376 nfs4_opendata_put(data); 2377 } 2378 2379 static const struct rpc_call_ops nfs4_open_confirm_ops = { 2380 .rpc_call_prepare = nfs4_open_confirm_prepare, 2381 .rpc_call_done = nfs4_open_confirm_done, 2382 .rpc_release = nfs4_open_confirm_release, 2383 }; 2384 2385 /* 2386 * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata 2387 */ 2388 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) 2389 { 2390 struct nfs_server *server = NFS_SERVER(d_inode(data->dir)); 2391 struct rpc_task *task; 2392 struct rpc_message msg = { 2393 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], 2394 .rpc_argp = &data->c_arg, 2395 .rpc_resp = &data->c_res, 2396 .rpc_cred = data->owner->so_cred, 2397 }; 2398 struct rpc_task_setup task_setup_data = { 2399 .rpc_client = server->client, 2400 .rpc_message = &msg, 2401 .callback_ops = &nfs4_open_confirm_ops, 2402 .callback_data = data, 2403 .workqueue = nfsiod_workqueue, 2404 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2405 }; 2406 int status; 2407 2408 nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1, 2409 data->is_recover); 2410 kref_get(&data->kref); 2411 data->rpc_done = false; 2412 data->rpc_status = 0; 2413 data->timestamp = jiffies; 2414 task = rpc_run_task(&task_setup_data); 2415 if (IS_ERR(task)) 2416 return PTR_ERR(task); 2417 status = rpc_wait_for_completion_task(task); 2418 if (status != 0) { 2419 data->cancelled = true; 2420 smp_wmb(); 2421 } else 2422 status = data->rpc_status; 2423 rpc_put_task(task); 2424 return status; 2425 } 2426 2427 static void nfs4_open_prepare(struct rpc_task *task, void *calldata) 2428 { 2429 struct nfs4_opendata *data = calldata; 2430 struct nfs4_state_owner *sp = data->owner; 2431 struct nfs_client *clp = sp->so_server->nfs_client; 2432 enum open_claim_type4 claim = data->o_arg.claim; 2433 2434 if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) 2435 goto out_wait; 2436 /* 2437 * Check if we still need to send an OPEN call, or if we can use 2438 * a delegation instead. 2439 */ 2440 if (data->state != NULL) { 2441 struct nfs_delegation *delegation; 2442 2443 if (can_open_cached(data->state, data->o_arg.fmode, 2444 data->o_arg.open_flags, claim)) 2445 goto out_no_action; 2446 rcu_read_lock(); 2447 delegation = nfs4_get_valid_delegation(data->state->inode); 2448 if (can_open_delegated(delegation, data->o_arg.fmode, claim)) 2449 goto unlock_no_action; 2450 rcu_read_unlock(); 2451 } 2452 /* Update client id. */ 2453 data->o_arg.clientid = clp->cl_clientid; 2454 switch (claim) { 2455 default: 2456 break; 2457 case NFS4_OPEN_CLAIM_PREVIOUS: 2458 case NFS4_OPEN_CLAIM_DELEG_CUR_FH: 2459 case NFS4_OPEN_CLAIM_DELEG_PREV_FH: 2460 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0]; 2461 fallthrough; 2462 case NFS4_OPEN_CLAIM_FH: 2463 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; 2464 } 2465 data->timestamp = jiffies; 2466 if (nfs4_setup_sequence(data->o_arg.server->nfs_client, 2467 &data->o_arg.seq_args, 2468 &data->o_res.seq_res, 2469 task) != 0) 2470 nfs_release_seqid(data->o_arg.seqid); 2471 2472 /* Set the create mode (note dependency on the session type) */ 2473 data->o_arg.createmode = NFS4_CREATE_UNCHECKED; 2474 if (data->o_arg.open_flags & O_EXCL) { 2475 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1; 2476 if (clp->cl_mvops->minor_version == 0) { 2477 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE; 2478 /* don't put an ACCESS op in OPEN compound if O_EXCL, 2479 * because ACCESS will return permission denied for 2480 * all bits until close */ 2481 data->o_res.access_request = data->o_arg.access = 0; 2482 } else if (nfs4_has_persistent_session(clp)) 2483 data->o_arg.createmode = NFS4_CREATE_GUARDED; 2484 } 2485 return; 2486 unlock_no_action: 2487 trace_nfs4_cached_open(data->state); 2488 rcu_read_unlock(); 2489 out_no_action: 2490 task->tk_action = NULL; 2491 out_wait: 2492 nfs4_sequence_done(task, &data->o_res.seq_res); 2493 } 2494 2495 static void nfs4_open_done(struct rpc_task *task, void *calldata) 2496 { 2497 struct nfs4_opendata *data = calldata; 2498 2499 data->rpc_status = task->tk_status; 2500 2501 if (!nfs4_sequence_process(task, &data->o_res.seq_res)) 2502 return; 2503 2504 if (task->tk_status == 0) { 2505 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) { 2506 switch (data->o_res.f_attr->mode & S_IFMT) { 2507 case S_IFREG: 2508 break; 2509 case S_IFLNK: 2510 data->rpc_status = -ELOOP; 2511 break; 2512 case S_IFDIR: 2513 data->rpc_status = -EISDIR; 2514 break; 2515 default: 2516 data->rpc_status = -ENOTDIR; 2517 } 2518 } 2519 renew_lease(data->o_res.server, data->timestamp); 2520 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)) 2521 nfs_confirm_seqid(&data->owner->so_seqid, 0); 2522 } 2523 data->rpc_done = true; 2524 } 2525 2526 static void nfs4_open_release(void *calldata) 2527 { 2528 struct nfs4_opendata *data = calldata; 2529 struct nfs4_state *state = NULL; 2530 2531 /* If this request hasn't been cancelled, do nothing */ 2532 if (!data->cancelled) 2533 goto out_free; 2534 /* In case of error, no cleanup! */ 2535 if (data->rpc_status != 0 || !data->rpc_done) 2536 goto out_free; 2537 /* In case we need an open_confirm, no cleanup! */ 2538 if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) 2539 goto out_free; 2540 state = nfs4_opendata_to_nfs4_state(data); 2541 if (!IS_ERR(state)) 2542 nfs4_close_state(state, data->o_arg.fmode); 2543 out_free: 2544 nfs4_opendata_put(data); 2545 } 2546 2547 static const struct rpc_call_ops nfs4_open_ops = { 2548 .rpc_call_prepare = nfs4_open_prepare, 2549 .rpc_call_done = nfs4_open_done, 2550 .rpc_release = nfs4_open_release, 2551 }; 2552 2553 static int nfs4_run_open_task(struct nfs4_opendata *data, 2554 struct nfs_open_context *ctx) 2555 { 2556 struct inode *dir = d_inode(data->dir); 2557 struct nfs_server *server = NFS_SERVER(dir); 2558 struct nfs_openargs *o_arg = &data->o_arg; 2559 struct nfs_openres *o_res = &data->o_res; 2560 struct rpc_task *task; 2561 struct rpc_message msg = { 2562 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], 2563 .rpc_argp = o_arg, 2564 .rpc_resp = o_res, 2565 .rpc_cred = data->owner->so_cred, 2566 }; 2567 struct rpc_task_setup task_setup_data = { 2568 .rpc_client = server->client, 2569 .rpc_message = &msg, 2570 .callback_ops = &nfs4_open_ops, 2571 .callback_data = data, 2572 .workqueue = nfsiod_workqueue, 2573 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 2574 }; 2575 int status; 2576 2577 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 2578 task_setup_data.flags |= RPC_TASK_MOVEABLE; 2579 2580 kref_get(&data->kref); 2581 data->rpc_done = false; 2582 data->rpc_status = 0; 2583 data->cancelled = false; 2584 data->is_recover = false; 2585 if (!ctx) { 2586 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1); 2587 data->is_recover = true; 2588 task_setup_data.flags |= RPC_TASK_TIMEOUT; 2589 } else { 2590 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0); 2591 pnfs_lgopen_prepare(data, ctx); 2592 } 2593 task = rpc_run_task(&task_setup_data); 2594 if (IS_ERR(task)) 2595 return PTR_ERR(task); 2596 status = rpc_wait_for_completion_task(task); 2597 if (status != 0) { 2598 data->cancelled = true; 2599 smp_wmb(); 2600 } else 2601 status = data->rpc_status; 2602 rpc_put_task(task); 2603 2604 return status; 2605 } 2606 2607 static int _nfs4_recover_proc_open(struct nfs4_opendata *data) 2608 { 2609 struct inode *dir = d_inode(data->dir); 2610 struct nfs_openres *o_res = &data->o_res; 2611 int status; 2612 2613 status = nfs4_run_open_task(data, NULL); 2614 if (status != 0 || !data->rpc_done) 2615 return status; 2616 2617 nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr); 2618 2619 if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) 2620 status = _nfs4_proc_open_confirm(data); 2621 2622 return status; 2623 } 2624 2625 /* 2626 * Additional permission checks in order to distinguish between an 2627 * open for read, and an open for execute. This works around the 2628 * fact that NFSv4 OPEN treats read and execute permissions as being 2629 * the same. 2630 * Note that in the non-execute case, we want to turn off permission 2631 * checking if we just created a new file (POSIX open() semantics). 2632 */ 2633 static int nfs4_opendata_access(const struct cred *cred, 2634 struct nfs4_opendata *opendata, 2635 struct nfs4_state *state, fmode_t fmode) 2636 { 2637 struct nfs_access_entry cache; 2638 u32 mask, flags; 2639 2640 /* access call failed or for some reason the server doesn't 2641 * support any access modes -- defer access call until later */ 2642 if (opendata->o_res.access_supported == 0) 2643 return 0; 2644 2645 mask = 0; 2646 if (fmode & FMODE_EXEC) { 2647 /* ONLY check for exec rights */ 2648 if (S_ISDIR(state->inode->i_mode)) 2649 mask = NFS4_ACCESS_LOOKUP; 2650 else 2651 mask = NFS4_ACCESS_EXECUTE; 2652 } else if ((fmode & FMODE_READ) && !opendata->file_created) 2653 mask = NFS4_ACCESS_READ; 2654 2655 nfs_access_set_mask(&cache, opendata->o_res.access_result); 2656 nfs_access_add_cache(state->inode, &cache, cred); 2657 2658 flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP; 2659 if ((mask & ~cache.mask & flags) == 0) 2660 return 0; 2661 2662 return -EACCES; 2663 } 2664 2665 /* 2666 * Note: On error, nfs4_proc_open will free the struct nfs4_opendata 2667 */ 2668 static int _nfs4_proc_open(struct nfs4_opendata *data, 2669 struct nfs_open_context *ctx) 2670 { 2671 struct inode *dir = d_inode(data->dir); 2672 struct nfs_server *server = NFS_SERVER(dir); 2673 struct nfs_openargs *o_arg = &data->o_arg; 2674 struct nfs_openres *o_res = &data->o_res; 2675 int status; 2676 2677 status = nfs4_run_open_task(data, ctx); 2678 if (!data->rpc_done) 2679 return status; 2680 if (status != 0) { 2681 if (status == -NFS4ERR_BADNAME && 2682 !(o_arg->open_flags & O_CREAT)) 2683 return -ENOENT; 2684 return status; 2685 } 2686 2687 nfs_fattr_map_and_free_names(server, &data->f_attr); 2688 2689 if (o_arg->open_flags & O_CREAT) { 2690 if (o_arg->open_flags & O_EXCL) 2691 data->file_created = true; 2692 else if (o_res->cinfo.before != o_res->cinfo.after) 2693 data->file_created = true; 2694 if (data->file_created || 2695 inode_peek_iversion_raw(dir) != o_res->cinfo.after) 2696 nfs4_update_changeattr(dir, &o_res->cinfo, 2697 o_res->f_attr->time_start, 2698 NFS_INO_INVALID_DATA); 2699 } 2700 if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0) 2701 server->caps &= ~NFS_CAP_POSIX_LOCK; 2702 if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { 2703 status = _nfs4_proc_open_confirm(data); 2704 if (status != 0) 2705 return status; 2706 } 2707 if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) { 2708 struct nfs_fh *fh = &o_res->fh; 2709 2710 nfs4_sequence_free_slot(&o_res->seq_res); 2711 if (o_arg->claim == NFS4_OPEN_CLAIM_FH) 2712 fh = NFS_FH(d_inode(data->dentry)); 2713 nfs4_proc_getattr(server, fh, o_res->f_attr, NULL); 2714 } 2715 return 0; 2716 } 2717 2718 /* 2719 * OPEN_EXPIRED: 2720 * reclaim state on the server after a network partition. 2721 * Assumes caller holds the appropriate lock 2722 */ 2723 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2724 { 2725 struct nfs4_opendata *opendata; 2726 int ret; 2727 2728 opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH); 2729 if (IS_ERR(opendata)) 2730 return PTR_ERR(opendata); 2731 /* 2732 * We're not recovering a delegation, so ask for no delegation. 2733 * Otherwise the recovery thread could deadlock with an outstanding 2734 * delegation return. 2735 */ 2736 opendata->o_arg.open_flags = O_DIRECT; 2737 ret = nfs4_open_recover(opendata, state); 2738 if (ret == -ESTALE) 2739 d_drop(ctx->dentry); 2740 nfs4_opendata_put(opendata); 2741 return ret; 2742 } 2743 2744 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state) 2745 { 2746 struct nfs_server *server = NFS_SERVER(state->inode); 2747 struct nfs4_exception exception = { }; 2748 int err; 2749 2750 do { 2751 err = _nfs4_open_expired(ctx, state); 2752 trace_nfs4_open_expired(ctx, 0, err); 2753 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception)) 2754 continue; 2755 switch (err) { 2756 default: 2757 goto out; 2758 case -NFS4ERR_GRACE: 2759 case -NFS4ERR_DELAY: 2760 nfs4_handle_exception(server, err, &exception); 2761 err = 0; 2762 } 2763 } while (exception.retry); 2764 out: 2765 return err; 2766 } 2767 2768 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2769 { 2770 struct nfs_open_context *ctx; 2771 int ret; 2772 2773 ctx = nfs4_state_find_open_context(state); 2774 if (IS_ERR(ctx)) 2775 return -EAGAIN; 2776 ret = nfs4_do_open_expired(ctx, state); 2777 put_nfs_open_context(ctx); 2778 return ret; 2779 } 2780 2781 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state, 2782 const nfs4_stateid *stateid) 2783 { 2784 nfs_remove_bad_delegation(state->inode, stateid); 2785 nfs_state_clear_delegation(state); 2786 } 2787 2788 static void nfs40_clear_delegation_stateid(struct nfs4_state *state) 2789 { 2790 if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL) 2791 nfs_finish_clear_delegation_stateid(state, NULL); 2792 } 2793 2794 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2795 { 2796 /* NFSv4.0 doesn't allow for delegation recovery on open expire */ 2797 nfs40_clear_delegation_stateid(state); 2798 nfs_state_clear_open_state_flags(state); 2799 return nfs4_open_expired(sp, state); 2800 } 2801 2802 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server, 2803 nfs4_stateid *stateid, 2804 const struct cred *cred) 2805 { 2806 return -NFS4ERR_BAD_STATEID; 2807 } 2808 2809 #if defined(CONFIG_NFS_V4_1) 2810 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server, 2811 nfs4_stateid *stateid, 2812 const struct cred *cred) 2813 { 2814 int status; 2815 2816 switch (stateid->type) { 2817 default: 2818 break; 2819 case NFS4_INVALID_STATEID_TYPE: 2820 case NFS4_SPECIAL_STATEID_TYPE: 2821 return -NFS4ERR_BAD_STATEID; 2822 case NFS4_REVOKED_STATEID_TYPE: 2823 goto out_free; 2824 } 2825 2826 status = nfs41_test_stateid(server, stateid, cred); 2827 switch (status) { 2828 case -NFS4ERR_EXPIRED: 2829 case -NFS4ERR_ADMIN_REVOKED: 2830 case -NFS4ERR_DELEG_REVOKED: 2831 break; 2832 default: 2833 return status; 2834 } 2835 out_free: 2836 /* Ack the revoked state to the server */ 2837 nfs41_free_stateid(server, stateid, cred, true); 2838 return -NFS4ERR_EXPIRED; 2839 } 2840 2841 static int nfs41_check_delegation_stateid(struct nfs4_state *state) 2842 { 2843 struct nfs_server *server = NFS_SERVER(state->inode); 2844 nfs4_stateid stateid; 2845 struct nfs_delegation *delegation; 2846 const struct cred *cred = NULL; 2847 int status, ret = NFS_OK; 2848 2849 /* Get the delegation credential for use by test/free_stateid */ 2850 rcu_read_lock(); 2851 delegation = rcu_dereference(NFS_I(state->inode)->delegation); 2852 if (delegation == NULL) { 2853 rcu_read_unlock(); 2854 nfs_state_clear_delegation(state); 2855 return NFS_OK; 2856 } 2857 2858 spin_lock(&delegation->lock); 2859 nfs4_stateid_copy(&stateid, &delegation->stateid); 2860 2861 if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, 2862 &delegation->flags)) { 2863 spin_unlock(&delegation->lock); 2864 rcu_read_unlock(); 2865 return NFS_OK; 2866 } 2867 2868 if (delegation->cred) 2869 cred = get_cred(delegation->cred); 2870 spin_unlock(&delegation->lock); 2871 rcu_read_unlock(); 2872 status = nfs41_test_and_free_expired_stateid(server, &stateid, cred); 2873 trace_nfs4_test_delegation_stateid(state, NULL, status); 2874 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) 2875 nfs_finish_clear_delegation_stateid(state, &stateid); 2876 else 2877 ret = status; 2878 2879 put_cred(cred); 2880 return ret; 2881 } 2882 2883 static void nfs41_delegation_recover_stateid(struct nfs4_state *state) 2884 { 2885 nfs4_stateid tmp; 2886 2887 if (test_bit(NFS_DELEGATED_STATE, &state->flags) && 2888 nfs4_copy_delegation_stateid(state->inode, state->state, 2889 &tmp, NULL) && 2890 nfs4_stateid_match_other(&state->stateid, &tmp)) 2891 nfs_state_set_delegation(state, &tmp, state->state); 2892 else 2893 nfs_state_clear_delegation(state); 2894 } 2895 2896 /** 2897 * nfs41_check_expired_locks - possibly free a lock stateid 2898 * 2899 * @state: NFSv4 state for an inode 2900 * 2901 * Returns NFS_OK if recovery for this stateid is now finished. 2902 * Otherwise a negative NFS4ERR value is returned. 2903 */ 2904 static int nfs41_check_expired_locks(struct nfs4_state *state) 2905 { 2906 int status, ret = NFS_OK; 2907 struct nfs4_lock_state *lsp, *prev = NULL; 2908 struct nfs_server *server = NFS_SERVER(state->inode); 2909 2910 if (!test_bit(LK_STATE_IN_USE, &state->flags)) 2911 goto out; 2912 2913 spin_lock(&state->state_lock); 2914 list_for_each_entry(lsp, &state->lock_states, ls_locks) { 2915 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { 2916 const struct cred *cred = lsp->ls_state->owner->so_cred; 2917 2918 refcount_inc(&lsp->ls_count); 2919 spin_unlock(&state->state_lock); 2920 2921 nfs4_put_lock_state(prev); 2922 prev = lsp; 2923 2924 status = nfs41_test_and_free_expired_stateid(server, 2925 &lsp->ls_stateid, 2926 cred); 2927 trace_nfs4_test_lock_stateid(state, lsp, status); 2928 if (status == -NFS4ERR_EXPIRED || 2929 status == -NFS4ERR_BAD_STATEID) { 2930 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 2931 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE; 2932 if (!recover_lost_locks) 2933 set_bit(NFS_LOCK_LOST, &lsp->ls_flags); 2934 } else if (status != NFS_OK) { 2935 ret = status; 2936 nfs4_put_lock_state(prev); 2937 goto out; 2938 } 2939 spin_lock(&state->state_lock); 2940 } 2941 } 2942 spin_unlock(&state->state_lock); 2943 nfs4_put_lock_state(prev); 2944 out: 2945 return ret; 2946 } 2947 2948 /** 2949 * nfs41_check_open_stateid - possibly free an open stateid 2950 * 2951 * @state: NFSv4 state for an inode 2952 * 2953 * Returns NFS_OK if recovery for this stateid is now finished. 2954 * Otherwise a negative NFS4ERR value is returned. 2955 */ 2956 static int nfs41_check_open_stateid(struct nfs4_state *state) 2957 { 2958 struct nfs_server *server = NFS_SERVER(state->inode); 2959 nfs4_stateid *stateid = &state->open_stateid; 2960 const struct cred *cred = state->owner->so_cred; 2961 int status; 2962 2963 if (test_bit(NFS_OPEN_STATE, &state->flags) == 0) 2964 return -NFS4ERR_BAD_STATEID; 2965 status = nfs41_test_and_free_expired_stateid(server, stateid, cred); 2966 trace_nfs4_test_open_stateid(state, NULL, status); 2967 if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) { 2968 nfs_state_clear_open_state_flags(state); 2969 stateid->type = NFS4_INVALID_STATEID_TYPE; 2970 return status; 2971 } 2972 if (nfs_open_stateid_recover_openmode(state)) 2973 return -NFS4ERR_OPENMODE; 2974 return NFS_OK; 2975 } 2976 2977 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) 2978 { 2979 int status; 2980 2981 status = nfs41_check_delegation_stateid(state); 2982 if (status != NFS_OK) 2983 return status; 2984 nfs41_delegation_recover_stateid(state); 2985 2986 status = nfs41_check_expired_locks(state); 2987 if (status != NFS_OK) 2988 return status; 2989 status = nfs41_check_open_stateid(state); 2990 if (status != NFS_OK) 2991 status = nfs4_open_expired(sp, state); 2992 return status; 2993 } 2994 #endif 2995 2996 /* 2997 * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-* 2998 * fields corresponding to attributes that were used to store the verifier. 2999 * Make sure we clobber those fields in the later setattr call 3000 */ 3001 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata, 3002 struct iattr *sattr, struct nfs4_label **label) 3003 { 3004 const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask; 3005 __u32 attrset[3]; 3006 unsigned ret; 3007 unsigned i; 3008 3009 for (i = 0; i < ARRAY_SIZE(attrset); i++) { 3010 attrset[i] = opendata->o_res.attrset[i]; 3011 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1) 3012 attrset[i] &= ~bitmask[i]; 3013 } 3014 3015 ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ? 3016 sattr->ia_valid : 0; 3017 3018 if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) { 3019 if (sattr->ia_valid & ATTR_ATIME_SET) 3020 ret |= ATTR_ATIME_SET; 3021 else 3022 ret |= ATTR_ATIME; 3023 } 3024 3025 if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) { 3026 if (sattr->ia_valid & ATTR_MTIME_SET) 3027 ret |= ATTR_MTIME_SET; 3028 else 3029 ret |= ATTR_MTIME; 3030 } 3031 3032 if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL)) 3033 *label = NULL; 3034 return ret; 3035 } 3036 3037 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata, 3038 struct nfs_open_context *ctx) 3039 { 3040 struct nfs4_state_owner *sp = opendata->owner; 3041 struct nfs_server *server = sp->so_server; 3042 struct dentry *dentry; 3043 struct nfs4_state *state; 3044 fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx); 3045 struct inode *dir = d_inode(opendata->dir); 3046 unsigned long dir_verifier; 3047 unsigned int seq; 3048 int ret; 3049 3050 seq = raw_seqcount_begin(&sp->so_reclaim_seqcount); 3051 dir_verifier = nfs_save_change_attribute(dir); 3052 3053 ret = _nfs4_proc_open(opendata, ctx); 3054 if (ret != 0) 3055 goto out; 3056 3057 state = _nfs4_opendata_to_nfs4_state(opendata); 3058 ret = PTR_ERR(state); 3059 if (IS_ERR(state)) 3060 goto out; 3061 ctx->state = state; 3062 if (server->caps & NFS_CAP_POSIX_LOCK) 3063 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags); 3064 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK) 3065 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags); 3066 if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED) 3067 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags); 3068 3069 dentry = opendata->dentry; 3070 if (d_really_is_negative(dentry)) { 3071 struct dentry *alias; 3072 d_drop(dentry); 3073 alias = d_exact_alias(dentry, state->inode); 3074 if (!alias) 3075 alias = d_splice_alias(igrab(state->inode), dentry); 3076 /* d_splice_alias() can't fail here - it's a non-directory */ 3077 if (alias) { 3078 dput(ctx->dentry); 3079 ctx->dentry = dentry = alias; 3080 } 3081 } 3082 3083 switch(opendata->o_arg.claim) { 3084 default: 3085 break; 3086 case NFS4_OPEN_CLAIM_NULL: 3087 case NFS4_OPEN_CLAIM_DELEGATE_CUR: 3088 case NFS4_OPEN_CLAIM_DELEGATE_PREV: 3089 if (!opendata->rpc_done) 3090 break; 3091 if (opendata->o_res.delegation_type != 0) 3092 dir_verifier = nfs_save_change_attribute(dir); 3093 nfs_set_verifier(dentry, dir_verifier); 3094 } 3095 3096 /* Parse layoutget results before we check for access */ 3097 pnfs_parse_lgopen(state->inode, opendata->lgp, ctx); 3098 3099 ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode); 3100 if (ret != 0) 3101 goto out; 3102 3103 if (d_inode(dentry) == state->inode) { 3104 nfs_inode_attach_open_context(ctx); 3105 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq)) 3106 nfs4_schedule_stateid_recovery(server, state); 3107 } 3108 3109 out: 3110 if (!opendata->cancelled) { 3111 if (opendata->lgp) { 3112 nfs4_lgopen_release(opendata->lgp); 3113 opendata->lgp = NULL; 3114 } 3115 nfs4_sequence_free_slot(&opendata->o_res.seq_res); 3116 } 3117 return ret; 3118 } 3119 3120 /* 3121 * Returns a referenced nfs4_state 3122 */ 3123 static int _nfs4_do_open(struct inode *dir, 3124 struct nfs_open_context *ctx, 3125 int flags, 3126 const struct nfs4_open_createattrs *c, 3127 int *opened) 3128 { 3129 struct nfs4_state_owner *sp; 3130 struct nfs4_state *state = NULL; 3131 struct nfs_server *server = NFS_SERVER(dir); 3132 struct nfs4_opendata *opendata; 3133 struct dentry *dentry = ctx->dentry; 3134 const struct cred *cred = ctx->cred; 3135 struct nfs4_threshold **ctx_th = &ctx->mdsthreshold; 3136 fmode_t fmode = _nfs4_ctx_to_openmode(ctx); 3137 enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL; 3138 struct iattr *sattr = c->sattr; 3139 struct nfs4_label *label = c->label; 3140 int status; 3141 3142 /* Protect against reboot recovery conflicts */ 3143 status = -ENOMEM; 3144 sp = nfs4_get_state_owner(server, cred, GFP_KERNEL); 3145 if (sp == NULL) { 3146 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); 3147 goto out_err; 3148 } 3149 status = nfs4_client_recover_expired_lease(server->nfs_client); 3150 if (status != 0) 3151 goto err_put_state_owner; 3152 if (d_really_is_positive(dentry)) 3153 nfs4_return_incompatible_delegation(d_inode(dentry), fmode); 3154 status = -ENOMEM; 3155 if (d_really_is_positive(dentry)) 3156 claim = NFS4_OPEN_CLAIM_FH; 3157 opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, 3158 c, claim, GFP_KERNEL); 3159 if (opendata == NULL) 3160 goto err_put_state_owner; 3161 3162 if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) { 3163 if (!opendata->f_attr.mdsthreshold) { 3164 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc(); 3165 if (!opendata->f_attr.mdsthreshold) 3166 goto err_opendata_put; 3167 } 3168 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0]; 3169 } 3170 if (d_really_is_positive(dentry)) 3171 opendata->state = nfs4_get_open_state(d_inode(dentry), sp); 3172 3173 status = _nfs4_open_and_get_state(opendata, ctx); 3174 if (status != 0) 3175 goto err_opendata_put; 3176 state = ctx->state; 3177 3178 if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) && 3179 (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) { 3180 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label); 3181 /* 3182 * send create attributes which was not set by open 3183 * with an extra setattr. 3184 */ 3185 if (attrs || label) { 3186 unsigned ia_old = sattr->ia_valid; 3187 3188 sattr->ia_valid = attrs; 3189 nfs_fattr_init(opendata->o_res.f_attr); 3190 status = nfs4_do_setattr(state->inode, cred, 3191 opendata->o_res.f_attr, sattr, 3192 ctx, label); 3193 if (status == 0) { 3194 nfs_setattr_update_inode(state->inode, sattr, 3195 opendata->o_res.f_attr); 3196 nfs_setsecurity(state->inode, opendata->o_res.f_attr); 3197 } 3198 sattr->ia_valid = ia_old; 3199 } 3200 } 3201 if (opened && opendata->file_created) 3202 *opened = 1; 3203 3204 if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) { 3205 *ctx_th = opendata->f_attr.mdsthreshold; 3206 opendata->f_attr.mdsthreshold = NULL; 3207 } 3208 3209 nfs4_opendata_put(opendata); 3210 nfs4_put_state_owner(sp); 3211 return 0; 3212 err_opendata_put: 3213 nfs4_opendata_put(opendata); 3214 err_put_state_owner: 3215 nfs4_put_state_owner(sp); 3216 out_err: 3217 return status; 3218 } 3219 3220 3221 static struct nfs4_state *nfs4_do_open(struct inode *dir, 3222 struct nfs_open_context *ctx, 3223 int flags, 3224 struct iattr *sattr, 3225 struct nfs4_label *label, 3226 int *opened) 3227 { 3228 struct nfs_server *server = NFS_SERVER(dir); 3229 struct nfs4_exception exception = { 3230 .interruptible = true, 3231 }; 3232 struct nfs4_state *res; 3233 struct nfs4_open_createattrs c = { 3234 .label = label, 3235 .sattr = sattr, 3236 .verf = { 3237 [0] = (__u32)jiffies, 3238 [1] = (__u32)current->pid, 3239 }, 3240 }; 3241 int status; 3242 3243 do { 3244 status = _nfs4_do_open(dir, ctx, flags, &c, opened); 3245 res = ctx->state; 3246 trace_nfs4_open_file(ctx, flags, status); 3247 if (status == 0) 3248 break; 3249 /* NOTE: BAD_SEQID means the server and client disagree about the 3250 * book-keeping w.r.t. state-changing operations 3251 * (OPEN/CLOSE/LOCK/LOCKU...) 3252 * It is actually a sign of a bug on the client or on the server. 3253 * 3254 * If we receive a BAD_SEQID error in the particular case of 3255 * doing an OPEN, we assume that nfs_increment_open_seqid() will 3256 * have unhashed the old state_owner for us, and that we can 3257 * therefore safely retry using a new one. We should still warn 3258 * the user though... 3259 */ 3260 if (status == -NFS4ERR_BAD_SEQID) { 3261 pr_warn_ratelimited("NFS: v4 server %s " 3262 " returned a bad sequence-id error!\n", 3263 NFS_SERVER(dir)->nfs_client->cl_hostname); 3264 exception.retry = 1; 3265 continue; 3266 } 3267 /* 3268 * BAD_STATEID on OPEN means that the server cancelled our 3269 * state before it received the OPEN_CONFIRM. 3270 * Recover by retrying the request as per the discussion 3271 * on Page 181 of RFC3530. 3272 */ 3273 if (status == -NFS4ERR_BAD_STATEID) { 3274 exception.retry = 1; 3275 continue; 3276 } 3277 if (status == -NFS4ERR_EXPIRED) { 3278 nfs4_schedule_lease_recovery(server->nfs_client); 3279 exception.retry = 1; 3280 continue; 3281 } 3282 if (status == -EAGAIN) { 3283 /* We must have found a delegation */ 3284 exception.retry = 1; 3285 continue; 3286 } 3287 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception)) 3288 continue; 3289 res = ERR_PTR(nfs4_handle_exception(server, 3290 status, &exception)); 3291 } while (exception.retry); 3292 return res; 3293 } 3294 3295 static int _nfs4_do_setattr(struct inode *inode, 3296 struct nfs_setattrargs *arg, 3297 struct nfs_setattrres *res, 3298 const struct cred *cred, 3299 struct nfs_open_context *ctx) 3300 { 3301 struct nfs_server *server = NFS_SERVER(inode); 3302 struct rpc_message msg = { 3303 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 3304 .rpc_argp = arg, 3305 .rpc_resp = res, 3306 .rpc_cred = cred, 3307 }; 3308 const struct cred *delegation_cred = NULL; 3309 unsigned long timestamp = jiffies; 3310 bool truncate; 3311 int status; 3312 3313 nfs_fattr_init(res->fattr); 3314 3315 /* Servers should only apply open mode checks for file size changes */ 3316 truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false; 3317 if (!truncate) { 3318 nfs4_inode_make_writeable(inode); 3319 goto zero_stateid; 3320 } 3321 3322 if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) { 3323 /* Use that stateid */ 3324 } else if (ctx != NULL && ctx->state) { 3325 struct nfs_lock_context *l_ctx; 3326 if (!nfs4_valid_open_stateid(ctx->state)) 3327 return -EBADF; 3328 l_ctx = nfs_get_lock_context(ctx); 3329 if (IS_ERR(l_ctx)) 3330 return PTR_ERR(l_ctx); 3331 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx, 3332 &arg->stateid, &delegation_cred); 3333 nfs_put_lock_context(l_ctx); 3334 if (status == -EIO) 3335 return -EBADF; 3336 else if (status == -EAGAIN) 3337 goto zero_stateid; 3338 } else { 3339 zero_stateid: 3340 nfs4_stateid_copy(&arg->stateid, &zero_stateid); 3341 } 3342 if (delegation_cred) 3343 msg.rpc_cred = delegation_cred; 3344 3345 status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1); 3346 3347 put_cred(delegation_cred); 3348 if (status == 0 && ctx != NULL) 3349 renew_lease(server, timestamp); 3350 trace_nfs4_setattr(inode, &arg->stateid, status); 3351 return status; 3352 } 3353 3354 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred, 3355 struct nfs_fattr *fattr, struct iattr *sattr, 3356 struct nfs_open_context *ctx, struct nfs4_label *ilabel) 3357 { 3358 struct nfs_server *server = NFS_SERVER(inode); 3359 __u32 bitmask[NFS4_BITMASK_SZ]; 3360 struct nfs4_state *state = ctx ? ctx->state : NULL; 3361 struct nfs_setattrargs arg = { 3362 .fh = NFS_FH(inode), 3363 .iap = sattr, 3364 .server = server, 3365 .bitmask = bitmask, 3366 .label = ilabel, 3367 }; 3368 struct nfs_setattrres res = { 3369 .fattr = fattr, 3370 .server = server, 3371 }; 3372 struct nfs4_exception exception = { 3373 .state = state, 3374 .inode = inode, 3375 .stateid = &arg.stateid, 3376 }; 3377 unsigned long adjust_flags = NFS_INO_INVALID_CHANGE; 3378 int err; 3379 3380 if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID)) 3381 adjust_flags |= NFS_INO_INVALID_MODE; 3382 if (sattr->ia_valid & (ATTR_UID | ATTR_GID)) 3383 adjust_flags |= NFS_INO_INVALID_OTHER; 3384 3385 do { 3386 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), 3387 inode, adjust_flags); 3388 3389 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx); 3390 switch (err) { 3391 case -NFS4ERR_OPENMODE: 3392 if (!(sattr->ia_valid & ATTR_SIZE)) { 3393 pr_warn_once("NFSv4: server %s is incorrectly " 3394 "applying open mode checks to " 3395 "a SETATTR that is not " 3396 "changing file size.\n", 3397 server->nfs_client->cl_hostname); 3398 } 3399 if (state && !(state->state & FMODE_WRITE)) { 3400 err = -EBADF; 3401 if (sattr->ia_valid & ATTR_OPEN) 3402 err = -EACCES; 3403 goto out; 3404 } 3405 } 3406 err = nfs4_handle_exception(server, err, &exception); 3407 } while (exception.retry); 3408 out: 3409 return err; 3410 } 3411 3412 static bool 3413 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task) 3414 { 3415 if (inode == NULL || !nfs_have_layout(inode)) 3416 return false; 3417 3418 return pnfs_wait_on_layoutreturn(inode, task); 3419 } 3420 3421 /* 3422 * Update the seqid of an open stateid 3423 */ 3424 static void nfs4_sync_open_stateid(nfs4_stateid *dst, 3425 struct nfs4_state *state) 3426 { 3427 __be32 seqid_open; 3428 u32 dst_seqid; 3429 int seq; 3430 3431 for (;;) { 3432 if (!nfs4_valid_open_stateid(state)) 3433 break; 3434 seq = read_seqbegin(&state->seqlock); 3435 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3436 nfs4_stateid_copy(dst, &state->open_stateid); 3437 if (read_seqretry(&state->seqlock, seq)) 3438 continue; 3439 break; 3440 } 3441 seqid_open = state->open_stateid.seqid; 3442 if (read_seqretry(&state->seqlock, seq)) 3443 continue; 3444 3445 dst_seqid = be32_to_cpu(dst->seqid); 3446 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0) 3447 dst->seqid = seqid_open; 3448 break; 3449 } 3450 } 3451 3452 /* 3453 * Update the seqid of an open stateid after receiving 3454 * NFS4ERR_OLD_STATEID 3455 */ 3456 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, 3457 struct nfs4_state *state) 3458 { 3459 __be32 seqid_open; 3460 u32 dst_seqid; 3461 bool ret; 3462 int seq, status = -EAGAIN; 3463 DEFINE_WAIT(wait); 3464 3465 for (;;) { 3466 ret = false; 3467 if (!nfs4_valid_open_stateid(state)) 3468 break; 3469 seq = read_seqbegin(&state->seqlock); 3470 if (!nfs4_state_match_open_stateid_other(state, dst)) { 3471 if (read_seqretry(&state->seqlock, seq)) 3472 continue; 3473 break; 3474 } 3475 3476 write_seqlock(&state->seqlock); 3477 seqid_open = state->open_stateid.seqid; 3478 3479 dst_seqid = be32_to_cpu(dst->seqid); 3480 3481 /* Did another OPEN bump the state's seqid? try again: */ 3482 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { 3483 dst->seqid = seqid_open; 3484 write_sequnlock(&state->seqlock); 3485 ret = true; 3486 break; 3487 } 3488 3489 /* server says we're behind but we haven't seen the update yet */ 3490 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); 3491 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); 3492 write_sequnlock(&state->seqlock); 3493 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); 3494 3495 if (fatal_signal_pending(current)) 3496 status = -EINTR; 3497 else 3498 if (schedule_timeout(5*HZ) != 0) 3499 status = 0; 3500 3501 finish_wait(&state->waitq, &wait); 3502 3503 if (!status) 3504 continue; 3505 if (status == -EINTR) 3506 break; 3507 3508 /* we slept the whole 5 seconds, we must have lost a seqid */ 3509 dst->seqid = cpu_to_be32(dst_seqid + 1); 3510 ret = true; 3511 break; 3512 } 3513 3514 return ret; 3515 } 3516 3517 struct nfs4_closedata { 3518 struct inode *inode; 3519 struct nfs4_state *state; 3520 struct nfs_closeargs arg; 3521 struct nfs_closeres res; 3522 struct { 3523 struct nfs4_layoutreturn_args arg; 3524 struct nfs4_layoutreturn_res res; 3525 struct nfs4_xdr_opaque_data ld_private; 3526 u32 roc_barrier; 3527 bool roc; 3528 } lr; 3529 struct nfs_fattr fattr; 3530 unsigned long timestamp; 3531 }; 3532 3533 static void nfs4_free_closedata(void *data) 3534 { 3535 struct nfs4_closedata *calldata = data; 3536 struct nfs4_state_owner *sp = calldata->state->owner; 3537 struct super_block *sb = calldata->state->inode->i_sb; 3538 3539 if (calldata->lr.roc) 3540 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res, 3541 calldata->res.lr_ret); 3542 nfs4_put_open_state(calldata->state); 3543 nfs_free_seqid(calldata->arg.seqid); 3544 nfs4_put_state_owner(sp); 3545 nfs_sb_deactive(sb); 3546 kfree(calldata); 3547 } 3548 3549 static void nfs4_close_done(struct rpc_task *task, void *data) 3550 { 3551 struct nfs4_closedata *calldata = data; 3552 struct nfs4_state *state = calldata->state; 3553 struct nfs_server *server = NFS_SERVER(calldata->inode); 3554 nfs4_stateid *res_stateid = NULL; 3555 struct nfs4_exception exception = { 3556 .state = state, 3557 .inode = calldata->inode, 3558 .stateid = &calldata->arg.stateid, 3559 }; 3560 3561 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 3562 return; 3563 trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status); 3564 3565 /* Handle Layoutreturn errors */ 3566 if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res, 3567 &calldata->res.lr_ret) == -EAGAIN) 3568 goto out_restart; 3569 3570 /* hmm. we are done with the inode, and in the process of freeing 3571 * the state_owner. we keep this around to process errors 3572 */ 3573 switch (task->tk_status) { 3574 case 0: 3575 res_stateid = &calldata->res.stateid; 3576 renew_lease(server, calldata->timestamp); 3577 break; 3578 case -NFS4ERR_ACCESS: 3579 if (calldata->arg.bitmask != NULL) { 3580 calldata->arg.bitmask = NULL; 3581 calldata->res.fattr = NULL; 3582 goto out_restart; 3583 3584 } 3585 break; 3586 case -NFS4ERR_OLD_STATEID: 3587 /* Did we race with OPEN? */ 3588 if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid, 3589 state)) 3590 goto out_restart; 3591 goto out_release; 3592 case -NFS4ERR_ADMIN_REVOKED: 3593 case -NFS4ERR_STALE_STATEID: 3594 case -NFS4ERR_EXPIRED: 3595 nfs4_free_revoked_stateid(server, 3596 &calldata->arg.stateid, 3597 task->tk_msg.rpc_cred); 3598 fallthrough; 3599 case -NFS4ERR_BAD_STATEID: 3600 if (calldata->arg.fmode == 0) 3601 break; 3602 fallthrough; 3603 default: 3604 task->tk_status = nfs4_async_handle_exception(task, 3605 server, task->tk_status, &exception); 3606 if (exception.retry) 3607 goto out_restart; 3608 } 3609 nfs_clear_open_stateid(state, &calldata->arg.stateid, 3610 res_stateid, calldata->arg.fmode); 3611 out_release: 3612 task->tk_status = 0; 3613 nfs_release_seqid(calldata->arg.seqid); 3614 nfs_refresh_inode(calldata->inode, &calldata->fattr); 3615 dprintk("%s: ret = %d\n", __func__, task->tk_status); 3616 return; 3617 out_restart: 3618 task->tk_status = 0; 3619 rpc_restart_call_prepare(task); 3620 goto out_release; 3621 } 3622 3623 static void nfs4_close_prepare(struct rpc_task *task, void *data) 3624 { 3625 struct nfs4_closedata *calldata = data; 3626 struct nfs4_state *state = calldata->state; 3627 struct inode *inode = calldata->inode; 3628 struct nfs_server *server = NFS_SERVER(inode); 3629 struct pnfs_layout_hdr *lo; 3630 bool is_rdonly, is_wronly, is_rdwr; 3631 int call_close = 0; 3632 3633 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 3634 goto out_wait; 3635 3636 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; 3637 spin_lock(&state->owner->so_lock); 3638 is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); 3639 is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); 3640 is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); 3641 /* Calculate the change in open mode */ 3642 calldata->arg.fmode = 0; 3643 if (state->n_rdwr == 0) { 3644 if (state->n_rdonly == 0) 3645 call_close |= is_rdonly; 3646 else if (is_rdonly) 3647 calldata->arg.fmode |= FMODE_READ; 3648 if (state->n_wronly == 0) 3649 call_close |= is_wronly; 3650 else if (is_wronly) 3651 calldata->arg.fmode |= FMODE_WRITE; 3652 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE)) 3653 call_close |= is_rdwr; 3654 } else if (is_rdwr) 3655 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; 3656 3657 nfs4_sync_open_stateid(&calldata->arg.stateid, state); 3658 if (!nfs4_valid_open_stateid(state)) 3659 call_close = 0; 3660 spin_unlock(&state->owner->so_lock); 3661 3662 if (!call_close) { 3663 /* Note: exit _without_ calling nfs4_close_done */ 3664 goto out_no_action; 3665 } 3666 3667 if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) { 3668 nfs_release_seqid(calldata->arg.seqid); 3669 goto out_wait; 3670 } 3671 3672 lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL; 3673 if (lo && !pnfs_layout_is_valid(lo)) { 3674 calldata->arg.lr_args = NULL; 3675 calldata->res.lr_res = NULL; 3676 } 3677 3678 if (calldata->arg.fmode == 0) 3679 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE]; 3680 3681 if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) { 3682 /* Close-to-open cache consistency revalidation */ 3683 if (!nfs4_have_delegation(inode, FMODE_READ)) { 3684 nfs4_bitmask_set(calldata->arg.bitmask_store, 3685 server->cache_consistency_bitmask, 3686 inode, 0); 3687 calldata->arg.bitmask = calldata->arg.bitmask_store; 3688 } else 3689 calldata->arg.bitmask = NULL; 3690 } 3691 3692 calldata->arg.share_access = 3693 nfs4_map_atomic_open_share(NFS_SERVER(inode), 3694 calldata->arg.fmode, 0); 3695 3696 if (calldata->res.fattr == NULL) 3697 calldata->arg.bitmask = NULL; 3698 else if (calldata->arg.bitmask == NULL) 3699 calldata->res.fattr = NULL; 3700 calldata->timestamp = jiffies; 3701 if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client, 3702 &calldata->arg.seq_args, 3703 &calldata->res.seq_res, 3704 task) != 0) 3705 nfs_release_seqid(calldata->arg.seqid); 3706 return; 3707 out_no_action: 3708 task->tk_action = NULL; 3709 out_wait: 3710 nfs4_sequence_done(task, &calldata->res.seq_res); 3711 } 3712 3713 static const struct rpc_call_ops nfs4_close_ops = { 3714 .rpc_call_prepare = nfs4_close_prepare, 3715 .rpc_call_done = nfs4_close_done, 3716 .rpc_release = nfs4_free_closedata, 3717 }; 3718 3719 /* 3720 * It is possible for data to be read/written from a mem-mapped file 3721 * after the sys_close call (which hits the vfs layer as a flush). 3722 * This means that we can't safely call nfsv4 close on a file until 3723 * the inode is cleared. This in turn means that we are not good 3724 * NFSv4 citizens - we do not indicate to the server to update the file's 3725 * share state even when we are done with one of the three share 3726 * stateid's in the inode. 3727 * 3728 * NOTE: Caller must be holding the sp->so_owner semaphore! 3729 */ 3730 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait) 3731 { 3732 struct nfs_server *server = NFS_SERVER(state->inode); 3733 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 3734 struct nfs4_closedata *calldata; 3735 struct nfs4_state_owner *sp = state->owner; 3736 struct rpc_task *task; 3737 struct rpc_message msg = { 3738 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], 3739 .rpc_cred = state->owner->so_cred, 3740 }; 3741 struct rpc_task_setup task_setup_data = { 3742 .rpc_client = server->client, 3743 .rpc_message = &msg, 3744 .callback_ops = &nfs4_close_ops, 3745 .workqueue = nfsiod_workqueue, 3746 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 3747 }; 3748 int status = -ENOMEM; 3749 3750 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 3751 task_setup_data.flags |= RPC_TASK_MOVEABLE; 3752 3753 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP, 3754 &task_setup_data.rpc_client, &msg); 3755 3756 calldata = kzalloc(sizeof(*calldata), gfp_mask); 3757 if (calldata == NULL) 3758 goto out; 3759 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0); 3760 calldata->inode = state->inode; 3761 calldata->state = state; 3762 calldata->arg.fh = NFS_FH(state->inode); 3763 if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state)) 3764 goto out_free_calldata; 3765 /* Serialization for the sequence id */ 3766 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 3767 calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask); 3768 if (IS_ERR(calldata->arg.seqid)) 3769 goto out_free_calldata; 3770 nfs_fattr_init(&calldata->fattr); 3771 calldata->arg.fmode = 0; 3772 calldata->lr.arg.ld_private = &calldata->lr.ld_private; 3773 calldata->res.fattr = &calldata->fattr; 3774 calldata->res.seqid = calldata->arg.seqid; 3775 calldata->res.server = server; 3776 calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 3777 calldata->lr.roc = pnfs_roc(state->inode, 3778 &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred); 3779 if (calldata->lr.roc) { 3780 calldata->arg.lr_args = &calldata->lr.arg; 3781 calldata->res.lr_res = &calldata->lr.res; 3782 } 3783 nfs_sb_active(calldata->inode->i_sb); 3784 3785 msg.rpc_argp = &calldata->arg; 3786 msg.rpc_resp = &calldata->res; 3787 task_setup_data.callback_data = calldata; 3788 task = rpc_run_task(&task_setup_data); 3789 if (IS_ERR(task)) 3790 return PTR_ERR(task); 3791 status = 0; 3792 if (wait) 3793 status = rpc_wait_for_completion_task(task); 3794 rpc_put_task(task); 3795 return status; 3796 out_free_calldata: 3797 kfree(calldata); 3798 out: 3799 nfs4_put_open_state(state); 3800 nfs4_put_state_owner(sp); 3801 return status; 3802 } 3803 3804 static struct inode * 3805 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, 3806 int open_flags, struct iattr *attr, int *opened) 3807 { 3808 struct nfs4_state *state; 3809 struct nfs4_label l, *label; 3810 3811 label = nfs4_label_init_security(dir, ctx->dentry, attr, &l); 3812 3813 /* Protect against concurrent sillydeletes */ 3814 state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened); 3815 3816 nfs4_label_release_security(label); 3817 3818 if (IS_ERR(state)) 3819 return ERR_CAST(state); 3820 return state->inode; 3821 } 3822 3823 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync) 3824 { 3825 if (ctx->state == NULL) 3826 return; 3827 if (is_sync) 3828 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3829 else 3830 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx)); 3831 } 3832 3833 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL) 3834 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL) 3835 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL) 3836 3837 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3838 { 3839 u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion; 3840 struct nfs4_server_caps_arg args = { 3841 .fhandle = fhandle, 3842 .bitmask = bitmask, 3843 }; 3844 struct nfs4_server_caps_res res = {}; 3845 struct rpc_message msg = { 3846 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], 3847 .rpc_argp = &args, 3848 .rpc_resp = &res, 3849 }; 3850 int status; 3851 int i; 3852 3853 bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS | 3854 FATTR4_WORD0_FH_EXPIRE_TYPE | 3855 FATTR4_WORD0_LINK_SUPPORT | 3856 FATTR4_WORD0_SYMLINK_SUPPORT | 3857 FATTR4_WORD0_ACLSUPPORT | 3858 FATTR4_WORD0_CASE_INSENSITIVE | 3859 FATTR4_WORD0_CASE_PRESERVING; 3860 if (minorversion) 3861 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT; 3862 3863 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 3864 if (status == 0) { 3865 /* Sanity check the server answers */ 3866 switch (minorversion) { 3867 case 0: 3868 res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK; 3869 res.attr_bitmask[2] = 0; 3870 break; 3871 case 1: 3872 res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK; 3873 break; 3874 case 2: 3875 res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK; 3876 } 3877 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); 3878 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS | 3879 NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL); 3880 server->fattr_valid = NFS_ATTR_FATTR_V4; 3881 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL && 3882 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) 3883 server->caps |= NFS_CAP_ACLS; 3884 if (res.has_links != 0) 3885 server->caps |= NFS_CAP_HARDLINKS; 3886 if (res.has_symlinks != 0) 3887 server->caps |= NFS_CAP_SYMLINKS; 3888 if (res.case_insensitive) 3889 server->caps |= NFS_CAP_CASE_INSENSITIVE; 3890 if (res.case_preserving) 3891 server->caps |= NFS_CAP_CASE_PRESERVING; 3892 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 3893 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL) 3894 server->caps |= NFS_CAP_SECURITY_LABEL; 3895 #endif 3896 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS) 3897 server->caps |= NFS_CAP_FS_LOCATIONS; 3898 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID)) 3899 server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID; 3900 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE)) 3901 server->fattr_valid &= ~NFS_ATTR_FATTR_MODE; 3902 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)) 3903 server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK; 3904 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER)) 3905 server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER | 3906 NFS_ATTR_FATTR_OWNER_NAME); 3907 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)) 3908 server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP | 3909 NFS_ATTR_FATTR_GROUP_NAME); 3910 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED)) 3911 server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED; 3912 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)) 3913 server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME; 3914 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)) 3915 server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME; 3916 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)) 3917 server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME; 3918 memcpy(server->attr_bitmask_nl, res.attr_bitmask, 3919 sizeof(server->attr_bitmask)); 3920 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL; 3921 3922 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask)); 3923 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE; 3924 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY; 3925 server->cache_consistency_bitmask[2] = 0; 3926 3927 /* Avoid a regression due to buggy server */ 3928 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++) 3929 res.exclcreat_bitmask[i] &= res.attr_bitmask[i]; 3930 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask, 3931 sizeof(server->exclcreat_bitmask)); 3932 3933 server->acl_bitmask = res.acl_bitmask; 3934 server->fh_expire_type = res.fh_expire_type; 3935 } 3936 3937 return status; 3938 } 3939 3940 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) 3941 { 3942 struct nfs4_exception exception = { 3943 .interruptible = true, 3944 }; 3945 int err; 3946 3947 nfs4_server_set_init_caps(server); 3948 do { 3949 err = nfs4_handle_exception(server, 3950 _nfs4_server_capabilities(server, fhandle), 3951 &exception); 3952 } while (exception.retry); 3953 return err; 3954 } 3955 3956 static void test_fs_location_for_trunking(struct nfs4_fs_location *location, 3957 struct nfs_client *clp, 3958 struct nfs_server *server) 3959 { 3960 int i; 3961 3962 for (i = 0; i < location->nservers; i++) { 3963 struct nfs4_string *srv_loc = &location->servers[i]; 3964 struct sockaddr_storage addr; 3965 size_t addrlen; 3966 struct xprt_create xprt_args = { 3967 .ident = 0, 3968 .net = clp->cl_net, 3969 }; 3970 struct nfs4_add_xprt_data xprtdata = { 3971 .clp = clp, 3972 }; 3973 struct rpc_add_xprt_test rpcdata = { 3974 .add_xprt_test = clp->cl_mvops->session_trunk, 3975 .data = &xprtdata, 3976 }; 3977 char *servername = NULL; 3978 3979 if (!srv_loc->len) 3980 continue; 3981 3982 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len, 3983 &addr, sizeof(addr), 3984 clp->cl_net, server->port); 3985 if (!addrlen) 3986 return; 3987 xprt_args.dstaddr = (struct sockaddr *)&addr; 3988 xprt_args.addrlen = addrlen; 3989 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL); 3990 if (!servername) 3991 return; 3992 memcpy(servername, srv_loc->data, srv_loc->len); 3993 servername[srv_loc->len] = '\0'; 3994 xprt_args.servername = servername; 3995 3996 xprtdata.cred = nfs4_get_clid_cred(clp); 3997 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, 3998 rpc_clnt_setup_test_and_add_xprt, 3999 &rpcdata); 4000 if (xprtdata.cred) 4001 put_cred(xprtdata.cred); 4002 kfree(servername); 4003 } 4004 } 4005 4006 static int _nfs4_discover_trunking(struct nfs_server *server, 4007 struct nfs_fh *fhandle) 4008 { 4009 struct nfs4_fs_locations *locations = NULL; 4010 struct page *page; 4011 const struct cred *cred; 4012 struct nfs_client *clp = server->nfs_client; 4013 const struct nfs4_state_maintenance_ops *ops = 4014 clp->cl_mvops->state_renewal_ops; 4015 int status = -ENOMEM, i; 4016 4017 cred = ops->get_state_renewal_cred(clp); 4018 if (cred == NULL) { 4019 cred = nfs4_get_clid_cred(clp); 4020 if (cred == NULL) 4021 return -ENOKEY; 4022 } 4023 4024 page = alloc_page(GFP_KERNEL); 4025 if (!page) 4026 goto out_put_cred; 4027 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4028 if (!locations) 4029 goto out_free; 4030 locations->fattr = nfs_alloc_fattr(); 4031 if (!locations->fattr) 4032 goto out_free_2; 4033 4034 status = nfs4_proc_get_locations(server, fhandle, locations, page, 4035 cred); 4036 if (status) 4037 goto out_free_3; 4038 4039 for (i = 0; i < locations->nlocations; i++) 4040 test_fs_location_for_trunking(&locations->locations[i], clp, 4041 server); 4042 out_free_3: 4043 kfree(locations->fattr); 4044 out_free_2: 4045 kfree(locations); 4046 out_free: 4047 __free_page(page); 4048 out_put_cred: 4049 put_cred(cred); 4050 return status; 4051 } 4052 4053 static int nfs4_discover_trunking(struct nfs_server *server, 4054 struct nfs_fh *fhandle) 4055 { 4056 struct nfs4_exception exception = { 4057 .interruptible = true, 4058 }; 4059 struct nfs_client *clp = server->nfs_client; 4060 int err = 0; 4061 4062 if (!nfs4_has_session(clp)) 4063 goto out; 4064 do { 4065 err = nfs4_handle_exception(server, 4066 _nfs4_discover_trunking(server, fhandle), 4067 &exception); 4068 } while (exception.retry); 4069 out: 4070 return err; 4071 } 4072 4073 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4074 struct nfs_fsinfo *info) 4075 { 4076 u32 bitmask[3]; 4077 struct nfs4_lookup_root_arg args = { 4078 .bitmask = bitmask, 4079 }; 4080 struct nfs4_lookup_res res = { 4081 .server = server, 4082 .fattr = info->fattr, 4083 .fh = fhandle, 4084 }; 4085 struct rpc_message msg = { 4086 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], 4087 .rpc_argp = &args, 4088 .rpc_resp = &res, 4089 }; 4090 4091 bitmask[0] = nfs4_fattr_bitmap[0]; 4092 bitmask[1] = nfs4_fattr_bitmap[1]; 4093 /* 4094 * Process the label in the upcoming getfattr 4095 */ 4096 bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL; 4097 4098 nfs_fattr_init(info->fattr); 4099 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4100 } 4101 4102 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, 4103 struct nfs_fsinfo *info) 4104 { 4105 struct nfs4_exception exception = { 4106 .interruptible = true, 4107 }; 4108 int err; 4109 do { 4110 err = _nfs4_lookup_root(server, fhandle, info); 4111 trace_nfs4_lookup_root(server, fhandle, info->fattr, err); 4112 switch (err) { 4113 case 0: 4114 case -NFS4ERR_WRONGSEC: 4115 goto out; 4116 default: 4117 err = nfs4_handle_exception(server, err, &exception); 4118 } 4119 } while (exception.retry); 4120 out: 4121 return err; 4122 } 4123 4124 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4125 struct nfs_fsinfo *info, rpc_authflavor_t flavor) 4126 { 4127 struct rpc_auth_create_args auth_args = { 4128 .pseudoflavor = flavor, 4129 }; 4130 struct rpc_auth *auth; 4131 4132 auth = rpcauth_create(&auth_args, server->client); 4133 if (IS_ERR(auth)) 4134 return -EACCES; 4135 return nfs4_lookup_root(server, fhandle, info); 4136 } 4137 4138 /* 4139 * Retry pseudoroot lookup with various security flavors. We do this when: 4140 * 4141 * NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC 4142 * NFSv4.1: the server does not support the SECINFO_NO_NAME operation 4143 * 4144 * Returns zero on success, or a negative NFS4ERR value, or a 4145 * negative errno value. 4146 */ 4147 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 4148 struct nfs_fsinfo *info) 4149 { 4150 /* Per 3530bis 15.33.5 */ 4151 static const rpc_authflavor_t flav_array[] = { 4152 RPC_AUTH_GSS_KRB5P, 4153 RPC_AUTH_GSS_KRB5I, 4154 RPC_AUTH_GSS_KRB5, 4155 RPC_AUTH_UNIX, /* courtesy */ 4156 RPC_AUTH_NULL, 4157 }; 4158 int status = -EPERM; 4159 size_t i; 4160 4161 if (server->auth_info.flavor_len > 0) { 4162 /* try each flavor specified by user */ 4163 for (i = 0; i < server->auth_info.flavor_len; i++) { 4164 status = nfs4_lookup_root_sec(server, fhandle, info, 4165 server->auth_info.flavors[i]); 4166 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4167 continue; 4168 break; 4169 } 4170 } else { 4171 /* no flavors specified by user, try default list */ 4172 for (i = 0; i < ARRAY_SIZE(flav_array); i++) { 4173 status = nfs4_lookup_root_sec(server, fhandle, info, 4174 flav_array[i]); 4175 if (status == -NFS4ERR_WRONGSEC || status == -EACCES) 4176 continue; 4177 break; 4178 } 4179 } 4180 4181 /* 4182 * -EACCES could mean that the user doesn't have correct permissions 4183 * to access the mount. It could also mean that we tried to mount 4184 * with a gss auth flavor, but rpc.gssd isn't running. Either way, 4185 * existing mount programs don't handle -EACCES very well so it should 4186 * be mapped to -EPERM instead. 4187 */ 4188 if (status == -EACCES) 4189 status = -EPERM; 4190 return status; 4191 } 4192 4193 /** 4194 * nfs4_proc_get_rootfh - get file handle for server's pseudoroot 4195 * @server: initialized nfs_server handle 4196 * @fhandle: we fill in the pseudo-fs root file handle 4197 * @info: we fill in an FSINFO struct 4198 * @auth_probe: probe the auth flavours 4199 * 4200 * Returns zero on success, or a negative errno. 4201 */ 4202 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle, 4203 struct nfs_fsinfo *info, 4204 bool auth_probe) 4205 { 4206 int status = 0; 4207 4208 if (!auth_probe) 4209 status = nfs4_lookup_root(server, fhandle, info); 4210 4211 if (auth_probe || status == NFS4ERR_WRONGSEC) 4212 status = server->nfs_client->cl_mvops->find_root_sec(server, 4213 fhandle, info); 4214 4215 if (status == 0) 4216 status = nfs4_server_capabilities(server, fhandle); 4217 if (status == 0) 4218 status = nfs4_do_fsinfo(server, fhandle, info); 4219 4220 return nfs4_map_errors(status); 4221 } 4222 4223 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh, 4224 struct nfs_fsinfo *info) 4225 { 4226 int error; 4227 struct nfs_fattr *fattr = info->fattr; 4228 4229 error = nfs4_server_capabilities(server, mntfh); 4230 if (error < 0) { 4231 dprintk("nfs4_get_root: getcaps error = %d\n", -error); 4232 return error; 4233 } 4234 4235 error = nfs4_proc_getattr(server, mntfh, fattr, NULL); 4236 if (error < 0) { 4237 dprintk("nfs4_get_root: getattr error = %d\n", -error); 4238 goto out; 4239 } 4240 4241 if (fattr->valid & NFS_ATTR_FATTR_FSID && 4242 !nfs_fsid_equal(&server->fsid, &fattr->fsid)) 4243 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid)); 4244 4245 out: 4246 return error; 4247 } 4248 4249 /* 4250 * Get locations and (maybe) other attributes of a referral. 4251 * Note that we'll actually follow the referral later when 4252 * we detect fsid mismatch in inode revalidation 4253 */ 4254 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir, 4255 const struct qstr *name, struct nfs_fattr *fattr, 4256 struct nfs_fh *fhandle) 4257 { 4258 int status = -ENOMEM; 4259 struct page *page = NULL; 4260 struct nfs4_fs_locations *locations = NULL; 4261 4262 page = alloc_page(GFP_KERNEL); 4263 if (page == NULL) 4264 goto out; 4265 locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); 4266 if (locations == NULL) 4267 goto out; 4268 4269 locations->fattr = fattr; 4270 4271 status = nfs4_proc_fs_locations(client, dir, name, locations, page); 4272 if (status != 0) 4273 goto out; 4274 4275 /* 4276 * If the fsid didn't change, this is a migration event, not a 4277 * referral. Cause us to drop into the exception handler, which 4278 * will kick off migration recovery. 4279 */ 4280 if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) { 4281 dprintk("%s: server did not return a different fsid for" 4282 " a referral at %s\n", __func__, name->name); 4283 status = -NFS4ERR_MOVED; 4284 goto out; 4285 } 4286 /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */ 4287 nfs_fixup_referral_attributes(fattr); 4288 memset(fhandle, 0, sizeof(struct nfs_fh)); 4289 out: 4290 if (page) 4291 __free_page(page); 4292 kfree(locations); 4293 return status; 4294 } 4295 4296 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4297 struct nfs_fattr *fattr, struct inode *inode) 4298 { 4299 __u32 bitmask[NFS4_BITMASK_SZ]; 4300 struct nfs4_getattr_arg args = { 4301 .fh = fhandle, 4302 .bitmask = bitmask, 4303 }; 4304 struct nfs4_getattr_res res = { 4305 .fattr = fattr, 4306 .server = server, 4307 }; 4308 struct rpc_message msg = { 4309 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 4310 .rpc_argp = &args, 4311 .rpc_resp = &res, 4312 }; 4313 unsigned short task_flags = 0; 4314 4315 if (nfs4_has_session(server->nfs_client)) 4316 task_flags = RPC_TASK_MOVEABLE; 4317 4318 /* Is this is an attribute revalidation, subject to softreval? */ 4319 if (inode && (server->flags & NFS_MOUNT_SOFTREVAL)) 4320 task_flags |= RPC_TASK_TIMEOUT; 4321 4322 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0); 4323 nfs_fattr_init(fattr); 4324 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4325 return nfs4_do_call_sync(server->client, server, &msg, 4326 &args.seq_args, &res.seq_res, task_flags); 4327 } 4328 4329 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 4330 struct nfs_fattr *fattr, struct inode *inode) 4331 { 4332 struct nfs4_exception exception = { 4333 .interruptible = true, 4334 }; 4335 int err; 4336 do { 4337 err = _nfs4_proc_getattr(server, fhandle, fattr, inode); 4338 trace_nfs4_getattr(server, fhandle, fattr, err); 4339 err = nfs4_handle_exception(server, err, 4340 &exception); 4341 } while (exception.retry); 4342 return err; 4343 } 4344 4345 /* 4346 * The file is not closed if it is opened due to the a request to change 4347 * the size of the file. The open call will not be needed once the 4348 * VFS layer lookup-intents are implemented. 4349 * 4350 * Close is called when the inode is destroyed. 4351 * If we haven't opened the file for O_WRONLY, we 4352 * need to in the size_change case to obtain a stateid. 4353 * 4354 * Got race? 4355 * Because OPEN is always done by name in nfsv4, it is 4356 * possible that we opened a different file by the same 4357 * name. We can recognize this race condition, but we 4358 * can't do anything about it besides returning an error. 4359 * 4360 * This will be fixed with VFS changes (lookup-intent). 4361 */ 4362 static int 4363 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, 4364 struct iattr *sattr) 4365 { 4366 struct inode *inode = d_inode(dentry); 4367 const struct cred *cred = NULL; 4368 struct nfs_open_context *ctx = NULL; 4369 int status; 4370 4371 if (pnfs_ld_layoutret_on_setattr(inode) && 4372 sattr->ia_valid & ATTR_SIZE && 4373 sattr->ia_size < i_size_read(inode)) 4374 pnfs_commit_and_return_layout(inode); 4375 4376 nfs_fattr_init(fattr); 4377 4378 /* Deal with open(O_TRUNC) */ 4379 if (sattr->ia_valid & ATTR_OPEN) 4380 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME); 4381 4382 /* Optimization: if the end result is no change, don't RPC */ 4383 if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0) 4384 return 0; 4385 4386 /* Search for an existing open(O_WRITE) file */ 4387 if (sattr->ia_valid & ATTR_FILE) { 4388 4389 ctx = nfs_file_open_context(sattr->ia_file); 4390 if (ctx) 4391 cred = ctx->cred; 4392 } 4393 4394 /* Return any delegations if we're going to change ACLs */ 4395 if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) 4396 nfs4_inode_make_writeable(inode); 4397 4398 status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL); 4399 if (status == 0) { 4400 nfs_setattr_update_inode(inode, sattr, fattr); 4401 nfs_setsecurity(inode, fattr); 4402 } 4403 return status; 4404 } 4405 4406 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir, 4407 struct dentry *dentry, struct nfs_fh *fhandle, 4408 struct nfs_fattr *fattr) 4409 { 4410 struct nfs_server *server = NFS_SERVER(dir); 4411 int status; 4412 struct nfs4_lookup_arg args = { 4413 .bitmask = server->attr_bitmask, 4414 .dir_fh = NFS_FH(dir), 4415 .name = &dentry->d_name, 4416 }; 4417 struct nfs4_lookup_res res = { 4418 .server = server, 4419 .fattr = fattr, 4420 .fh = fhandle, 4421 }; 4422 struct rpc_message msg = { 4423 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], 4424 .rpc_argp = &args, 4425 .rpc_resp = &res, 4426 }; 4427 unsigned short task_flags = 0; 4428 4429 if (nfs_server_capable(dir, NFS_CAP_MOVEABLE)) 4430 task_flags = RPC_TASK_MOVEABLE; 4431 4432 /* Is this is an attribute revalidation, subject to softreval? */ 4433 if (nfs_lookup_is_soft_revalidate(dentry)) 4434 task_flags |= RPC_TASK_TIMEOUT; 4435 4436 args.bitmask = nfs4_bitmask(server, fattr->label); 4437 4438 nfs_fattr_init(fattr); 4439 4440 dprintk("NFS call lookup %pd2\n", dentry); 4441 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 4442 status = nfs4_do_call_sync(clnt, server, &msg, 4443 &args.seq_args, &res.seq_res, task_flags); 4444 dprintk("NFS reply lookup: %d\n", status); 4445 return status; 4446 } 4447 4448 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr) 4449 { 4450 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 4451 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT; 4452 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 4453 fattr->nlink = 2; 4454 } 4455 4456 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir, 4457 struct dentry *dentry, struct nfs_fh *fhandle, 4458 struct nfs_fattr *fattr) 4459 { 4460 struct nfs4_exception exception = { 4461 .interruptible = true, 4462 }; 4463 struct rpc_clnt *client = *clnt; 4464 const struct qstr *name = &dentry->d_name; 4465 int err; 4466 do { 4467 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr); 4468 trace_nfs4_lookup(dir, name, err); 4469 switch (err) { 4470 case -NFS4ERR_BADNAME: 4471 err = -ENOENT; 4472 goto out; 4473 case -NFS4ERR_MOVED: 4474 err = nfs4_get_referral(client, dir, name, fattr, fhandle); 4475 if (err == -NFS4ERR_MOVED) 4476 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4477 goto out; 4478 case -NFS4ERR_WRONGSEC: 4479 err = -EPERM; 4480 if (client != *clnt) 4481 goto out; 4482 client = nfs4_negotiate_security(client, dir, name); 4483 if (IS_ERR(client)) 4484 return PTR_ERR(client); 4485 4486 exception.retry = 1; 4487 break; 4488 default: 4489 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception); 4490 } 4491 } while (exception.retry); 4492 4493 out: 4494 if (err == 0) 4495 *clnt = client; 4496 else if (client != *clnt) 4497 rpc_shutdown_client(client); 4498 4499 return err; 4500 } 4501 4502 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry, 4503 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4504 { 4505 int status; 4506 struct rpc_clnt *client = NFS_CLIENT(dir); 4507 4508 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4509 if (client != NFS_CLIENT(dir)) { 4510 rpc_shutdown_client(client); 4511 nfs_fixup_secinfo_attributes(fattr); 4512 } 4513 return status; 4514 } 4515 4516 struct rpc_clnt * 4517 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry, 4518 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4519 { 4520 struct rpc_clnt *client = NFS_CLIENT(dir); 4521 int status; 4522 4523 status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr); 4524 if (status < 0) 4525 return ERR_PTR(status); 4526 return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client; 4527 } 4528 4529 static int _nfs4_proc_lookupp(struct inode *inode, 4530 struct nfs_fh *fhandle, struct nfs_fattr *fattr) 4531 { 4532 struct rpc_clnt *clnt = NFS_CLIENT(inode); 4533 struct nfs_server *server = NFS_SERVER(inode); 4534 int status; 4535 struct nfs4_lookupp_arg args = { 4536 .bitmask = server->attr_bitmask, 4537 .fh = NFS_FH(inode), 4538 }; 4539 struct nfs4_lookupp_res res = { 4540 .server = server, 4541 .fattr = fattr, 4542 .fh = fhandle, 4543 }; 4544 struct rpc_message msg = { 4545 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP], 4546 .rpc_argp = &args, 4547 .rpc_resp = &res, 4548 }; 4549 unsigned short task_flags = 0; 4550 4551 if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 4552 task_flags |= RPC_TASK_TIMEOUT; 4553 4554 args.bitmask = nfs4_bitmask(server, fattr->label); 4555 4556 nfs_fattr_init(fattr); 4557 4558 dprintk("NFS call lookupp ino=0x%lx\n", inode->i_ino); 4559 status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, 4560 &res.seq_res, task_flags); 4561 dprintk("NFS reply lookupp: %d\n", status); 4562 return status; 4563 } 4564 4565 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle, 4566 struct nfs_fattr *fattr) 4567 { 4568 struct nfs4_exception exception = { 4569 .interruptible = true, 4570 }; 4571 int err; 4572 do { 4573 err = _nfs4_proc_lookupp(inode, fhandle, fattr); 4574 trace_nfs4_lookupp(inode, err); 4575 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4576 &exception); 4577 } while (exception.retry); 4578 return err; 4579 } 4580 4581 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4582 const struct cred *cred) 4583 { 4584 struct nfs_server *server = NFS_SERVER(inode); 4585 struct nfs4_accessargs args = { 4586 .fh = NFS_FH(inode), 4587 .access = entry->mask, 4588 }; 4589 struct nfs4_accessres res = { 4590 .server = server, 4591 }; 4592 struct rpc_message msg = { 4593 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], 4594 .rpc_argp = &args, 4595 .rpc_resp = &res, 4596 .rpc_cred = cred, 4597 }; 4598 int status = 0; 4599 4600 if (!nfs4_have_delegation(inode, FMODE_READ)) { 4601 res.fattr = nfs_alloc_fattr(); 4602 if (res.fattr == NULL) 4603 return -ENOMEM; 4604 args.bitmask = server->cache_consistency_bitmask; 4605 } 4606 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 4607 if (!status) { 4608 nfs_access_set_mask(entry, res.access); 4609 if (res.fattr) 4610 nfs_refresh_inode(inode, res.fattr); 4611 } 4612 nfs_free_fattr(res.fattr); 4613 return status; 4614 } 4615 4616 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry, 4617 const struct cred *cred) 4618 { 4619 struct nfs4_exception exception = { 4620 .interruptible = true, 4621 }; 4622 int err; 4623 do { 4624 err = _nfs4_proc_access(inode, entry, cred); 4625 trace_nfs4_access(inode, err); 4626 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4627 &exception); 4628 } while (exception.retry); 4629 return err; 4630 } 4631 4632 /* 4633 * TODO: For the time being, we don't try to get any attributes 4634 * along with any of the zero-copy operations READ, READDIR, 4635 * READLINK, WRITE. 4636 * 4637 * In the case of the first three, we want to put the GETATTR 4638 * after the read-type operation -- this is because it is hard 4639 * to predict the length of a GETATTR response in v4, and thus 4640 * align the READ data correctly. This means that the GETATTR 4641 * may end up partially falling into the page cache, and we should 4642 * shift it into the 'tail' of the xdr_buf before processing. 4643 * To do this efficiently, we need to know the total length 4644 * of data received, which doesn't seem to be available outside 4645 * of the RPC layer. 4646 * 4647 * In the case of WRITE, we also want to put the GETATTR after 4648 * the operation -- in this case because we want to make sure 4649 * we get the post-operation mtime and size. 4650 * 4651 * Both of these changes to the XDR layer would in fact be quite 4652 * minor, but I decided to leave them for a subsequent patch. 4653 */ 4654 static int _nfs4_proc_readlink(struct inode *inode, struct page *page, 4655 unsigned int pgbase, unsigned int pglen) 4656 { 4657 struct nfs4_readlink args = { 4658 .fh = NFS_FH(inode), 4659 .pgbase = pgbase, 4660 .pglen = pglen, 4661 .pages = &page, 4662 }; 4663 struct nfs4_readlink_res res; 4664 struct rpc_message msg = { 4665 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], 4666 .rpc_argp = &args, 4667 .rpc_resp = &res, 4668 }; 4669 4670 return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0); 4671 } 4672 4673 static int nfs4_proc_readlink(struct inode *inode, struct page *page, 4674 unsigned int pgbase, unsigned int pglen) 4675 { 4676 struct nfs4_exception exception = { 4677 .interruptible = true, 4678 }; 4679 int err; 4680 do { 4681 err = _nfs4_proc_readlink(inode, page, pgbase, pglen); 4682 trace_nfs4_readlink(inode, err); 4683 err = nfs4_handle_exception(NFS_SERVER(inode), err, 4684 &exception); 4685 } while (exception.retry); 4686 return err; 4687 } 4688 4689 /* 4690 * This is just for mknod. open(O_CREAT) will always do ->open_context(). 4691 */ 4692 static int 4693 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, 4694 int flags) 4695 { 4696 struct nfs_server *server = NFS_SERVER(dir); 4697 struct nfs4_label l, *ilabel; 4698 struct nfs_open_context *ctx; 4699 struct nfs4_state *state; 4700 int status = 0; 4701 4702 ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL); 4703 if (IS_ERR(ctx)) 4704 return PTR_ERR(ctx); 4705 4706 ilabel = nfs4_label_init_security(dir, dentry, sattr, &l); 4707 4708 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 4709 sattr->ia_mode &= ~current_umask(); 4710 state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL); 4711 if (IS_ERR(state)) { 4712 status = PTR_ERR(state); 4713 goto out; 4714 } 4715 out: 4716 nfs4_label_release_security(ilabel); 4717 put_nfs_open_context(ctx); 4718 return status; 4719 } 4720 4721 static int 4722 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype) 4723 { 4724 struct nfs_server *server = NFS_SERVER(dir); 4725 struct nfs_removeargs args = { 4726 .fh = NFS_FH(dir), 4727 .name = *name, 4728 }; 4729 struct nfs_removeres res = { 4730 .server = server, 4731 }; 4732 struct rpc_message msg = { 4733 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], 4734 .rpc_argp = &args, 4735 .rpc_resp = &res, 4736 }; 4737 unsigned long timestamp = jiffies; 4738 int status; 4739 4740 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1); 4741 if (status == 0) { 4742 spin_lock(&dir->i_lock); 4743 /* Removing a directory decrements nlink in the parent */ 4744 if (ftype == NF4DIR && dir->i_nlink > 2) 4745 nfs4_dec_nlink_locked(dir); 4746 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp, 4747 NFS_INO_INVALID_DATA); 4748 spin_unlock(&dir->i_lock); 4749 } 4750 return status; 4751 } 4752 4753 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry) 4754 { 4755 struct nfs4_exception exception = { 4756 .interruptible = true, 4757 }; 4758 struct inode *inode = d_inode(dentry); 4759 int err; 4760 4761 if (inode) { 4762 if (inode->i_nlink == 1) 4763 nfs4_inode_return_delegation(inode); 4764 else 4765 nfs4_inode_make_writeable(inode); 4766 } 4767 do { 4768 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG); 4769 trace_nfs4_remove(dir, &dentry->d_name, err); 4770 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4771 &exception); 4772 } while (exception.retry); 4773 return err; 4774 } 4775 4776 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name) 4777 { 4778 struct nfs4_exception exception = { 4779 .interruptible = true, 4780 }; 4781 int err; 4782 4783 do { 4784 err = _nfs4_proc_remove(dir, name, NF4DIR); 4785 trace_nfs4_remove(dir, name, err); 4786 err = nfs4_handle_exception(NFS_SERVER(dir), err, 4787 &exception); 4788 } while (exception.retry); 4789 return err; 4790 } 4791 4792 static void nfs4_proc_unlink_setup(struct rpc_message *msg, 4793 struct dentry *dentry, 4794 struct inode *inode) 4795 { 4796 struct nfs_removeargs *args = msg->rpc_argp; 4797 struct nfs_removeres *res = msg->rpc_resp; 4798 4799 res->server = NFS_SB(dentry->d_sb); 4800 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; 4801 nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0); 4802 4803 nfs_fattr_init(res->dir_attr); 4804 4805 if (inode) { 4806 nfs4_inode_return_delegation(inode); 4807 nfs_d_prune_case_insensitive_aliases(inode); 4808 } 4809 } 4810 4811 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data) 4812 { 4813 nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client, 4814 &data->args.seq_args, 4815 &data->res.seq_res, 4816 task); 4817 } 4818 4819 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir) 4820 { 4821 struct nfs_unlinkdata *data = task->tk_calldata; 4822 struct nfs_removeres *res = &data->res; 4823 4824 if (!nfs4_sequence_done(task, &res->seq_res)) 4825 return 0; 4826 if (nfs4_async_handle_error(task, res->server, NULL, 4827 &data->timeout) == -EAGAIN) 4828 return 0; 4829 if (task->tk_status == 0) 4830 nfs4_update_changeattr(dir, &res->cinfo, 4831 res->dir_attr->time_start, 4832 NFS_INO_INVALID_DATA); 4833 return 1; 4834 } 4835 4836 static void nfs4_proc_rename_setup(struct rpc_message *msg, 4837 struct dentry *old_dentry, 4838 struct dentry *new_dentry) 4839 { 4840 struct nfs_renameargs *arg = msg->rpc_argp; 4841 struct nfs_renameres *res = msg->rpc_resp; 4842 struct inode *old_inode = d_inode(old_dentry); 4843 struct inode *new_inode = d_inode(new_dentry); 4844 4845 if (old_inode) 4846 nfs4_inode_make_writeable(old_inode); 4847 if (new_inode) 4848 nfs4_inode_return_delegation(new_inode); 4849 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME]; 4850 res->server = NFS_SB(old_dentry->d_sb); 4851 nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0); 4852 } 4853 4854 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data) 4855 { 4856 nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client, 4857 &data->args.seq_args, 4858 &data->res.seq_res, 4859 task); 4860 } 4861 4862 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir, 4863 struct inode *new_dir) 4864 { 4865 struct nfs_renamedata *data = task->tk_calldata; 4866 struct nfs_renameres *res = &data->res; 4867 4868 if (!nfs4_sequence_done(task, &res->seq_res)) 4869 return 0; 4870 if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN) 4871 return 0; 4872 4873 if (task->tk_status == 0) { 4874 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry)); 4875 if (new_dir != old_dir) { 4876 /* Note: If we moved a directory, nlink will change */ 4877 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4878 res->old_fattr->time_start, 4879 NFS_INO_INVALID_NLINK | 4880 NFS_INO_INVALID_DATA); 4881 nfs4_update_changeattr(new_dir, &res->new_cinfo, 4882 res->new_fattr->time_start, 4883 NFS_INO_INVALID_NLINK | 4884 NFS_INO_INVALID_DATA); 4885 } else 4886 nfs4_update_changeattr(old_dir, &res->old_cinfo, 4887 res->old_fattr->time_start, 4888 NFS_INO_INVALID_DATA); 4889 } 4890 return 1; 4891 } 4892 4893 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4894 { 4895 struct nfs_server *server = NFS_SERVER(inode); 4896 __u32 bitmask[NFS4_BITMASK_SZ]; 4897 struct nfs4_link_arg arg = { 4898 .fh = NFS_FH(inode), 4899 .dir_fh = NFS_FH(dir), 4900 .name = name, 4901 .bitmask = bitmask, 4902 }; 4903 struct nfs4_link_res res = { 4904 .server = server, 4905 }; 4906 struct rpc_message msg = { 4907 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], 4908 .rpc_argp = &arg, 4909 .rpc_resp = &res, 4910 }; 4911 int status = -ENOMEM; 4912 4913 res.fattr = nfs_alloc_fattr_with_label(server); 4914 if (res.fattr == NULL) 4915 goto out; 4916 4917 nfs4_inode_make_writeable(inode); 4918 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode, 4919 NFS_INO_INVALID_CHANGE); 4920 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 4921 if (!status) { 4922 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start, 4923 NFS_INO_INVALID_DATA); 4924 nfs4_inc_nlink(inode); 4925 status = nfs_post_op_update_inode(inode, res.fattr); 4926 if (!status) 4927 nfs_setsecurity(inode, res.fattr); 4928 } 4929 4930 out: 4931 nfs_free_fattr(res.fattr); 4932 return status; 4933 } 4934 4935 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name) 4936 { 4937 struct nfs4_exception exception = { 4938 .interruptible = true, 4939 }; 4940 int err; 4941 do { 4942 err = nfs4_handle_exception(NFS_SERVER(inode), 4943 _nfs4_proc_link(inode, dir, name), 4944 &exception); 4945 } while (exception.retry); 4946 return err; 4947 } 4948 4949 struct nfs4_createdata { 4950 struct rpc_message msg; 4951 struct nfs4_create_arg arg; 4952 struct nfs4_create_res res; 4953 struct nfs_fh fh; 4954 struct nfs_fattr fattr; 4955 }; 4956 4957 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir, 4958 const struct qstr *name, struct iattr *sattr, u32 ftype) 4959 { 4960 struct nfs4_createdata *data; 4961 4962 data = kzalloc(sizeof(*data), GFP_KERNEL); 4963 if (data != NULL) { 4964 struct nfs_server *server = NFS_SERVER(dir); 4965 4966 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL); 4967 if (IS_ERR(data->fattr.label)) 4968 goto out_free; 4969 4970 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE]; 4971 data->msg.rpc_argp = &data->arg; 4972 data->msg.rpc_resp = &data->res; 4973 data->arg.dir_fh = NFS_FH(dir); 4974 data->arg.server = server; 4975 data->arg.name = name; 4976 data->arg.attrs = sattr; 4977 data->arg.ftype = ftype; 4978 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label); 4979 data->arg.umask = current_umask(); 4980 data->res.server = server; 4981 data->res.fh = &data->fh; 4982 data->res.fattr = &data->fattr; 4983 nfs_fattr_init(data->res.fattr); 4984 } 4985 return data; 4986 out_free: 4987 kfree(data); 4988 return NULL; 4989 } 4990 4991 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data) 4992 { 4993 int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg, 4994 &data->arg.seq_args, &data->res.seq_res, 1); 4995 if (status == 0) { 4996 spin_lock(&dir->i_lock); 4997 /* Creating a directory bumps nlink in the parent */ 4998 if (data->arg.ftype == NF4DIR) 4999 nfs4_inc_nlink_locked(dir); 5000 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo, 5001 data->res.fattr->time_start, 5002 NFS_INO_INVALID_DATA); 5003 spin_unlock(&dir->i_lock); 5004 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr); 5005 } 5006 return status; 5007 } 5008 5009 static void nfs4_free_createdata(struct nfs4_createdata *data) 5010 { 5011 nfs4_label_free(data->fattr.label); 5012 kfree(data); 5013 } 5014 5015 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5016 struct page *page, unsigned int len, struct iattr *sattr, 5017 struct nfs4_label *label) 5018 { 5019 struct nfs4_createdata *data; 5020 int status = -ENAMETOOLONG; 5021 5022 if (len > NFS4_MAXPATHLEN) 5023 goto out; 5024 5025 status = -ENOMEM; 5026 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK); 5027 if (data == NULL) 5028 goto out; 5029 5030 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK]; 5031 data->arg.u.symlink.pages = &page; 5032 data->arg.u.symlink.len = len; 5033 data->arg.label = label; 5034 5035 status = nfs4_do_create(dir, dentry, data); 5036 5037 nfs4_free_createdata(data); 5038 out: 5039 return status; 5040 } 5041 5042 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry, 5043 struct page *page, unsigned int len, struct iattr *sattr) 5044 { 5045 struct nfs4_exception exception = { 5046 .interruptible = true, 5047 }; 5048 struct nfs4_label l, *label; 5049 int err; 5050 5051 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5052 5053 do { 5054 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label); 5055 trace_nfs4_symlink(dir, &dentry->d_name, err); 5056 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5057 &exception); 5058 } while (exception.retry); 5059 5060 nfs4_label_release_security(label); 5061 return err; 5062 } 5063 5064 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5065 struct iattr *sattr, struct nfs4_label *label) 5066 { 5067 struct nfs4_createdata *data; 5068 int status = -ENOMEM; 5069 5070 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR); 5071 if (data == NULL) 5072 goto out; 5073 5074 data->arg.label = label; 5075 status = nfs4_do_create(dir, dentry, data); 5076 5077 nfs4_free_createdata(data); 5078 out: 5079 return status; 5080 } 5081 5082 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, 5083 struct iattr *sattr) 5084 { 5085 struct nfs_server *server = NFS_SERVER(dir); 5086 struct nfs4_exception exception = { 5087 .interruptible = true, 5088 }; 5089 struct nfs4_label l, *label; 5090 int err; 5091 5092 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5093 5094 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5095 sattr->ia_mode &= ~current_umask(); 5096 do { 5097 err = _nfs4_proc_mkdir(dir, dentry, sattr, label); 5098 trace_nfs4_mkdir(dir, &dentry->d_name, err); 5099 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5100 &exception); 5101 } while (exception.retry); 5102 nfs4_label_release_security(label); 5103 5104 return err; 5105 } 5106 5107 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg, 5108 struct nfs_readdir_res *nr_res) 5109 { 5110 struct inode *dir = d_inode(nr_arg->dentry); 5111 struct nfs_server *server = NFS_SERVER(dir); 5112 struct nfs4_readdir_arg args = { 5113 .fh = NFS_FH(dir), 5114 .pages = nr_arg->pages, 5115 .pgbase = 0, 5116 .count = nr_arg->page_len, 5117 .plus = nr_arg->plus, 5118 }; 5119 struct nfs4_readdir_res res; 5120 struct rpc_message msg = { 5121 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], 5122 .rpc_argp = &args, 5123 .rpc_resp = &res, 5124 .rpc_cred = nr_arg->cred, 5125 }; 5126 int status; 5127 5128 dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__, 5129 nr_arg->dentry, (unsigned long long)nr_arg->cookie); 5130 if (!(server->caps & NFS_CAP_SECURITY_LABEL)) 5131 args.bitmask = server->attr_bitmask_nl; 5132 else 5133 args.bitmask = server->attr_bitmask; 5134 5135 nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args); 5136 res.pgbase = args.pgbase; 5137 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, 5138 &res.seq_res, 0); 5139 if (status >= 0) { 5140 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE); 5141 status += args.pgbase; 5142 } 5143 5144 nfs_invalidate_atime(dir); 5145 5146 dprintk("%s: returns %d\n", __func__, status); 5147 return status; 5148 } 5149 5150 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg, 5151 struct nfs_readdir_res *res) 5152 { 5153 struct nfs4_exception exception = { 5154 .interruptible = true, 5155 }; 5156 int err; 5157 do { 5158 err = _nfs4_proc_readdir(arg, res); 5159 trace_nfs4_readdir(d_inode(arg->dentry), err); 5160 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)), 5161 err, &exception); 5162 } while (exception.retry); 5163 return err; 5164 } 5165 5166 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5167 struct iattr *sattr, struct nfs4_label *label, dev_t rdev) 5168 { 5169 struct nfs4_createdata *data; 5170 int mode = sattr->ia_mode; 5171 int status = -ENOMEM; 5172 5173 data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK); 5174 if (data == NULL) 5175 goto out; 5176 5177 if (S_ISFIFO(mode)) 5178 data->arg.ftype = NF4FIFO; 5179 else if (S_ISBLK(mode)) { 5180 data->arg.ftype = NF4BLK; 5181 data->arg.u.device.specdata1 = MAJOR(rdev); 5182 data->arg.u.device.specdata2 = MINOR(rdev); 5183 } 5184 else if (S_ISCHR(mode)) { 5185 data->arg.ftype = NF4CHR; 5186 data->arg.u.device.specdata1 = MAJOR(rdev); 5187 data->arg.u.device.specdata2 = MINOR(rdev); 5188 } else if (!S_ISSOCK(mode)) { 5189 status = -EINVAL; 5190 goto out_free; 5191 } 5192 5193 data->arg.label = label; 5194 status = nfs4_do_create(dir, dentry, data); 5195 out_free: 5196 nfs4_free_createdata(data); 5197 out: 5198 return status; 5199 } 5200 5201 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, 5202 struct iattr *sattr, dev_t rdev) 5203 { 5204 struct nfs_server *server = NFS_SERVER(dir); 5205 struct nfs4_exception exception = { 5206 .interruptible = true, 5207 }; 5208 struct nfs4_label l, *label; 5209 int err; 5210 5211 label = nfs4_label_init_security(dir, dentry, sattr, &l); 5212 5213 if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 5214 sattr->ia_mode &= ~current_umask(); 5215 do { 5216 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev); 5217 trace_nfs4_mknod(dir, &dentry->d_name, err); 5218 err = nfs4_handle_exception(NFS_SERVER(dir), err, 5219 &exception); 5220 } while (exception.retry); 5221 5222 nfs4_label_release_security(label); 5223 5224 return err; 5225 } 5226 5227 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, 5228 struct nfs_fsstat *fsstat) 5229 { 5230 struct nfs4_statfs_arg args = { 5231 .fh = fhandle, 5232 .bitmask = server->attr_bitmask, 5233 }; 5234 struct nfs4_statfs_res res = { 5235 .fsstat = fsstat, 5236 }; 5237 struct rpc_message msg = { 5238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], 5239 .rpc_argp = &args, 5240 .rpc_resp = &res, 5241 }; 5242 5243 nfs_fattr_init(fsstat->fattr); 5244 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5245 } 5246 5247 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) 5248 { 5249 struct nfs4_exception exception = { 5250 .interruptible = true, 5251 }; 5252 int err; 5253 do { 5254 err = nfs4_handle_exception(server, 5255 _nfs4_proc_statfs(server, fhandle, fsstat), 5256 &exception); 5257 } while (exception.retry); 5258 return err; 5259 } 5260 5261 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, 5262 struct nfs_fsinfo *fsinfo) 5263 { 5264 struct nfs4_fsinfo_arg args = { 5265 .fh = fhandle, 5266 .bitmask = server->attr_bitmask, 5267 }; 5268 struct nfs4_fsinfo_res res = { 5269 .fsinfo = fsinfo, 5270 }; 5271 struct rpc_message msg = { 5272 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], 5273 .rpc_argp = &args, 5274 .rpc_resp = &res, 5275 }; 5276 5277 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5278 } 5279 5280 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5281 { 5282 struct nfs4_exception exception = { 5283 .interruptible = true, 5284 }; 5285 int err; 5286 5287 do { 5288 err = _nfs4_do_fsinfo(server, fhandle, fsinfo); 5289 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err); 5290 if (err == 0) { 5291 nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ); 5292 break; 5293 } 5294 err = nfs4_handle_exception(server, err, &exception); 5295 } while (exception.retry); 5296 return err; 5297 } 5298 5299 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) 5300 { 5301 int error; 5302 5303 nfs_fattr_init(fsinfo->fattr); 5304 error = nfs4_do_fsinfo(server, fhandle, fsinfo); 5305 if (error == 0) { 5306 /* block layout checks this! */ 5307 server->pnfs_blksize = fsinfo->blksize; 5308 set_pnfs_layoutdriver(server, fhandle, fsinfo); 5309 } 5310 5311 return error; 5312 } 5313 5314 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5315 struct nfs_pathconf *pathconf) 5316 { 5317 struct nfs4_pathconf_arg args = { 5318 .fh = fhandle, 5319 .bitmask = server->attr_bitmask, 5320 }; 5321 struct nfs4_pathconf_res res = { 5322 .pathconf = pathconf, 5323 }; 5324 struct rpc_message msg = { 5325 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], 5326 .rpc_argp = &args, 5327 .rpc_resp = &res, 5328 }; 5329 5330 /* None of the pathconf attributes are mandatory to implement */ 5331 if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { 5332 memset(pathconf, 0, sizeof(*pathconf)); 5333 return 0; 5334 } 5335 5336 nfs_fattr_init(pathconf->fattr); 5337 return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 5338 } 5339 5340 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, 5341 struct nfs_pathconf *pathconf) 5342 { 5343 struct nfs4_exception exception = { 5344 .interruptible = true, 5345 }; 5346 int err; 5347 5348 do { 5349 err = nfs4_handle_exception(server, 5350 _nfs4_proc_pathconf(server, fhandle, pathconf), 5351 &exception); 5352 } while (exception.retry); 5353 return err; 5354 } 5355 5356 int nfs4_set_rw_stateid(nfs4_stateid *stateid, 5357 const struct nfs_open_context *ctx, 5358 const struct nfs_lock_context *l_ctx, 5359 fmode_t fmode) 5360 { 5361 return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL); 5362 } 5363 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid); 5364 5365 static bool nfs4_stateid_is_current(nfs4_stateid *stateid, 5366 const struct nfs_open_context *ctx, 5367 const struct nfs_lock_context *l_ctx, 5368 fmode_t fmode) 5369 { 5370 nfs4_stateid _current_stateid; 5371 5372 /* If the current stateid represents a lost lock, then exit */ 5373 if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO) 5374 return true; 5375 return nfs4_stateid_match(stateid, &_current_stateid); 5376 } 5377 5378 static bool nfs4_error_stateid_expired(int err) 5379 { 5380 switch (err) { 5381 case -NFS4ERR_DELEG_REVOKED: 5382 case -NFS4ERR_ADMIN_REVOKED: 5383 case -NFS4ERR_BAD_STATEID: 5384 case -NFS4ERR_STALE_STATEID: 5385 case -NFS4ERR_OLD_STATEID: 5386 case -NFS4ERR_OPENMODE: 5387 case -NFS4ERR_EXPIRED: 5388 return true; 5389 } 5390 return false; 5391 } 5392 5393 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr) 5394 { 5395 struct nfs_server *server = NFS_SERVER(hdr->inode); 5396 5397 trace_nfs4_read(hdr, task->tk_status); 5398 if (task->tk_status < 0) { 5399 struct nfs4_exception exception = { 5400 .inode = hdr->inode, 5401 .state = hdr->args.context->state, 5402 .stateid = &hdr->args.stateid, 5403 }; 5404 task->tk_status = nfs4_async_handle_exception(task, 5405 server, task->tk_status, &exception); 5406 if (exception.retry) { 5407 rpc_restart_call_prepare(task); 5408 return -EAGAIN; 5409 } 5410 } 5411 5412 if (task->tk_status > 0) 5413 renew_lease(server, hdr->timestamp); 5414 return 0; 5415 } 5416 5417 static bool nfs4_read_stateid_changed(struct rpc_task *task, 5418 struct nfs_pgio_args *args) 5419 { 5420 5421 if (!nfs4_error_stateid_expired(task->tk_status) || 5422 nfs4_stateid_is_current(&args->stateid, 5423 args->context, 5424 args->lock_context, 5425 FMODE_READ)) 5426 return false; 5427 rpc_restart_call_prepare(task); 5428 return true; 5429 } 5430 5431 static bool nfs4_read_plus_not_supported(struct rpc_task *task, 5432 struct nfs_pgio_header *hdr) 5433 { 5434 struct nfs_server *server = NFS_SERVER(hdr->inode); 5435 struct rpc_message *msg = &task->tk_msg; 5436 5437 if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] && 5438 server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) { 5439 server->caps &= ~NFS_CAP_READ_PLUS; 5440 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5441 rpc_restart_call_prepare(task); 5442 return true; 5443 } 5444 return false; 5445 } 5446 5447 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5448 { 5449 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5450 return -EAGAIN; 5451 if (nfs4_read_stateid_changed(task, &hdr->args)) 5452 return -EAGAIN; 5453 if (nfs4_read_plus_not_supported(task, hdr)) 5454 return -EAGAIN; 5455 if (task->tk_status > 0) 5456 nfs_invalidate_atime(hdr->inode); 5457 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5458 nfs4_read_done_cb(task, hdr); 5459 } 5460 5461 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS 5462 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5463 struct rpc_message *msg) 5464 { 5465 /* Note: We don't use READ_PLUS with pNFS yet */ 5466 if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) { 5467 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; 5468 return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE); 5469 } 5470 return false; 5471 } 5472 #else 5473 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr, 5474 struct rpc_message *msg) 5475 { 5476 return false; 5477 } 5478 #endif /* CONFIG_NFS_V4_2 */ 5479 5480 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, 5481 struct rpc_message *msg) 5482 { 5483 hdr->timestamp = jiffies; 5484 if (!hdr->pgio_done_cb) 5485 hdr->pgio_done_cb = nfs4_read_done_cb; 5486 if (!nfs42_read_plus_support(hdr, msg)) 5487 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; 5488 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5489 } 5490 5491 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task, 5492 struct nfs_pgio_header *hdr) 5493 { 5494 if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client, 5495 &hdr->args.seq_args, 5496 &hdr->res.seq_res, 5497 task)) 5498 return 0; 5499 if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context, 5500 hdr->args.lock_context, 5501 hdr->rw_mode) == -EIO) 5502 return -EIO; 5503 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) 5504 return -EIO; 5505 return 0; 5506 } 5507 5508 static int nfs4_write_done_cb(struct rpc_task *task, 5509 struct nfs_pgio_header *hdr) 5510 { 5511 struct inode *inode = hdr->inode; 5512 5513 trace_nfs4_write(hdr, task->tk_status); 5514 if (task->tk_status < 0) { 5515 struct nfs4_exception exception = { 5516 .inode = hdr->inode, 5517 .state = hdr->args.context->state, 5518 .stateid = &hdr->args.stateid, 5519 }; 5520 task->tk_status = nfs4_async_handle_exception(task, 5521 NFS_SERVER(inode), task->tk_status, 5522 &exception); 5523 if (exception.retry) { 5524 rpc_restart_call_prepare(task); 5525 return -EAGAIN; 5526 } 5527 } 5528 if (task->tk_status >= 0) { 5529 renew_lease(NFS_SERVER(inode), hdr->timestamp); 5530 nfs_writeback_update_inode(hdr); 5531 } 5532 return 0; 5533 } 5534 5535 static bool nfs4_write_stateid_changed(struct rpc_task *task, 5536 struct nfs_pgio_args *args) 5537 { 5538 5539 if (!nfs4_error_stateid_expired(task->tk_status) || 5540 nfs4_stateid_is_current(&args->stateid, 5541 args->context, 5542 args->lock_context, 5543 FMODE_WRITE)) 5544 return false; 5545 rpc_restart_call_prepare(task); 5546 return true; 5547 } 5548 5549 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr) 5550 { 5551 if (!nfs4_sequence_done(task, &hdr->res.seq_res)) 5552 return -EAGAIN; 5553 if (nfs4_write_stateid_changed(task, &hdr->args)) 5554 return -EAGAIN; 5555 return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) : 5556 nfs4_write_done_cb(task, hdr); 5557 } 5558 5559 static 5560 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr) 5561 { 5562 /* Don't request attributes for pNFS or O_DIRECT writes */ 5563 if (hdr->ds_clp != NULL || hdr->dreq != NULL) 5564 return false; 5565 /* Otherwise, request attributes if and only if we don't hold 5566 * a delegation 5567 */ 5568 return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0; 5569 } 5570 5571 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 5572 struct inode *inode, unsigned long cache_validity) 5573 { 5574 struct nfs_server *server = NFS_SERVER(inode); 5575 unsigned int i; 5576 5577 memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ); 5578 cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity); 5579 5580 if (cache_validity & NFS_INO_INVALID_CHANGE) 5581 bitmask[0] |= FATTR4_WORD0_CHANGE; 5582 if (cache_validity & NFS_INO_INVALID_ATIME) 5583 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS; 5584 if (cache_validity & NFS_INO_INVALID_MODE) 5585 bitmask[1] |= FATTR4_WORD1_MODE; 5586 if (cache_validity & NFS_INO_INVALID_OTHER) 5587 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP; 5588 if (cache_validity & NFS_INO_INVALID_NLINK) 5589 bitmask[1] |= FATTR4_WORD1_NUMLINKS; 5590 if (cache_validity & NFS_INO_INVALID_CTIME) 5591 bitmask[1] |= FATTR4_WORD1_TIME_METADATA; 5592 if (cache_validity & NFS_INO_INVALID_MTIME) 5593 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY; 5594 if (cache_validity & NFS_INO_INVALID_BLOCKS) 5595 bitmask[1] |= FATTR4_WORD1_SPACE_USED; 5596 5597 if (cache_validity & NFS_INO_INVALID_SIZE) 5598 bitmask[0] |= FATTR4_WORD0_SIZE; 5599 5600 for (i = 0; i < NFS4_BITMASK_SZ; i++) 5601 bitmask[i] &= server->attr_bitmask[i]; 5602 } 5603 5604 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr, 5605 struct rpc_message *msg, 5606 struct rpc_clnt **clnt) 5607 { 5608 struct nfs_server *server = NFS_SERVER(hdr->inode); 5609 5610 if (!nfs4_write_need_cache_consistency_data(hdr)) { 5611 hdr->args.bitmask = NULL; 5612 hdr->res.fattr = NULL; 5613 } else { 5614 nfs4_bitmask_set(hdr->args.bitmask_store, 5615 server->cache_consistency_bitmask, 5616 hdr->inode, NFS_INO_INVALID_BLOCKS); 5617 hdr->args.bitmask = hdr->args.bitmask_store; 5618 } 5619 5620 if (!hdr->pgio_done_cb) 5621 hdr->pgio_done_cb = nfs4_write_done_cb; 5622 hdr->res.server = server; 5623 hdr->timestamp = jiffies; 5624 5625 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE]; 5626 nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0); 5627 nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr); 5628 } 5629 5630 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data) 5631 { 5632 nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client, 5633 &data->args.seq_args, 5634 &data->res.seq_res, 5635 task); 5636 } 5637 5638 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data) 5639 { 5640 struct inode *inode = data->inode; 5641 5642 trace_nfs4_commit(data, task->tk_status); 5643 if (nfs4_async_handle_error(task, NFS_SERVER(inode), 5644 NULL, NULL) == -EAGAIN) { 5645 rpc_restart_call_prepare(task); 5646 return -EAGAIN; 5647 } 5648 return 0; 5649 } 5650 5651 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data) 5652 { 5653 if (!nfs4_sequence_done(task, &data->res.seq_res)) 5654 return -EAGAIN; 5655 return data->commit_done_cb(task, data); 5656 } 5657 5658 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg, 5659 struct rpc_clnt **clnt) 5660 { 5661 struct nfs_server *server = NFS_SERVER(data->inode); 5662 5663 if (data->commit_done_cb == NULL) 5664 data->commit_done_cb = nfs4_commit_done_cb; 5665 data->res.server = server; 5666 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT]; 5667 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 5668 nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client, 5669 NFS_SP4_MACH_CRED_COMMIT, clnt, msg); 5670 } 5671 5672 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args, 5673 struct nfs_commitres *res) 5674 { 5675 struct inode *dst_inode = file_inode(dst); 5676 struct nfs_server *server = NFS_SERVER(dst_inode); 5677 struct rpc_message msg = { 5678 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], 5679 .rpc_argp = args, 5680 .rpc_resp = res, 5681 }; 5682 5683 args->fh = NFS_FH(dst_inode); 5684 return nfs4_call_sync(server->client, server, &msg, 5685 &args->seq_args, &res->seq_res, 1); 5686 } 5687 5688 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res) 5689 { 5690 struct nfs_commitargs args = { 5691 .offset = offset, 5692 .count = count, 5693 }; 5694 struct nfs_server *dst_server = NFS_SERVER(file_inode(dst)); 5695 struct nfs4_exception exception = { }; 5696 int status; 5697 5698 do { 5699 status = _nfs4_proc_commit(dst, &args, res); 5700 status = nfs4_handle_exception(dst_server, status, &exception); 5701 } while (exception.retry); 5702 5703 return status; 5704 } 5705 5706 struct nfs4_renewdata { 5707 struct nfs_client *client; 5708 unsigned long timestamp; 5709 }; 5710 5711 /* 5712 * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special 5713 * standalone procedure for queueing an asynchronous RENEW. 5714 */ 5715 static void nfs4_renew_release(void *calldata) 5716 { 5717 struct nfs4_renewdata *data = calldata; 5718 struct nfs_client *clp = data->client; 5719 5720 if (refcount_read(&clp->cl_count) > 1) 5721 nfs4_schedule_state_renewal(clp); 5722 nfs_put_client(clp); 5723 kfree(data); 5724 } 5725 5726 static void nfs4_renew_done(struct rpc_task *task, void *calldata) 5727 { 5728 struct nfs4_renewdata *data = calldata; 5729 struct nfs_client *clp = data->client; 5730 unsigned long timestamp = data->timestamp; 5731 5732 trace_nfs4_renew_async(clp, task->tk_status); 5733 switch (task->tk_status) { 5734 case 0: 5735 break; 5736 case -NFS4ERR_LEASE_MOVED: 5737 nfs4_schedule_lease_moved_recovery(clp); 5738 break; 5739 default: 5740 /* Unless we're shutting down, schedule state recovery! */ 5741 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0) 5742 return; 5743 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) { 5744 nfs4_schedule_lease_recovery(clp); 5745 return; 5746 } 5747 nfs4_schedule_path_down_recovery(clp); 5748 } 5749 do_renew_lease(clp, timestamp); 5750 } 5751 5752 static const struct rpc_call_ops nfs4_renew_ops = { 5753 .rpc_call_done = nfs4_renew_done, 5754 .rpc_release = nfs4_renew_release, 5755 }; 5756 5757 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 5758 { 5759 struct rpc_message msg = { 5760 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5761 .rpc_argp = clp, 5762 .rpc_cred = cred, 5763 }; 5764 struct nfs4_renewdata *data; 5765 5766 if (renew_flags == 0) 5767 return 0; 5768 if (!refcount_inc_not_zero(&clp->cl_count)) 5769 return -EIO; 5770 data = kmalloc(sizeof(*data), GFP_NOFS); 5771 if (data == NULL) { 5772 nfs_put_client(clp); 5773 return -ENOMEM; 5774 } 5775 data->client = clp; 5776 data->timestamp = jiffies; 5777 return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT, 5778 &nfs4_renew_ops, data); 5779 } 5780 5781 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred) 5782 { 5783 struct rpc_message msg = { 5784 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], 5785 .rpc_argp = clp, 5786 .rpc_cred = cred, 5787 }; 5788 unsigned long now = jiffies; 5789 int status; 5790 5791 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT); 5792 if (status < 0) 5793 return status; 5794 do_renew_lease(clp, now); 5795 return 0; 5796 } 5797 5798 static bool nfs4_server_supports_acls(const struct nfs_server *server, 5799 enum nfs4_acl_type type) 5800 { 5801 switch (type) { 5802 default: 5803 return server->attr_bitmask[0] & FATTR4_WORD0_ACL; 5804 case NFS4ACL_DACL: 5805 return server->attr_bitmask[1] & FATTR4_WORD1_DACL; 5806 case NFS4ACL_SACL: 5807 return server->attr_bitmask[1] & FATTR4_WORD1_SACL; 5808 } 5809 } 5810 5811 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that 5812 * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on 5813 * the stack. 5814 */ 5815 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE) 5816 5817 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 5818 struct page **pages) 5819 { 5820 struct page *newpage, **spages; 5821 int rc = 0; 5822 size_t len; 5823 spages = pages; 5824 5825 do { 5826 len = min_t(size_t, PAGE_SIZE, buflen); 5827 newpage = alloc_page(GFP_KERNEL); 5828 5829 if (newpage == NULL) 5830 goto unwind; 5831 memcpy(page_address(newpage), buf, len); 5832 buf += len; 5833 buflen -= len; 5834 *pages++ = newpage; 5835 rc++; 5836 } while (buflen != 0); 5837 5838 return rc; 5839 5840 unwind: 5841 for(; rc > 0; rc--) 5842 __free_page(spages[rc-1]); 5843 return -ENOMEM; 5844 } 5845 5846 struct nfs4_cached_acl { 5847 enum nfs4_acl_type type; 5848 int cached; 5849 size_t len; 5850 char data[]; 5851 }; 5852 5853 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) 5854 { 5855 struct nfs_inode *nfsi = NFS_I(inode); 5856 5857 spin_lock(&inode->i_lock); 5858 kfree(nfsi->nfs4_acl); 5859 nfsi->nfs4_acl = acl; 5860 spin_unlock(&inode->i_lock); 5861 } 5862 5863 static void nfs4_zap_acl_attr(struct inode *inode) 5864 { 5865 nfs4_set_cached_acl(inode, NULL); 5866 } 5867 5868 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, 5869 size_t buflen, enum nfs4_acl_type type) 5870 { 5871 struct nfs_inode *nfsi = NFS_I(inode); 5872 struct nfs4_cached_acl *acl; 5873 int ret = -ENOENT; 5874 5875 spin_lock(&inode->i_lock); 5876 acl = nfsi->nfs4_acl; 5877 if (acl == NULL) 5878 goto out; 5879 if (acl->type != type) 5880 goto out; 5881 if (buf == NULL) /* user is just asking for length */ 5882 goto out_len; 5883 if (acl->cached == 0) 5884 goto out; 5885 ret = -ERANGE; /* see getxattr(2) man page */ 5886 if (acl->len > buflen) 5887 goto out; 5888 memcpy(buf, acl->data, acl->len); 5889 out_len: 5890 ret = acl->len; 5891 out: 5892 spin_unlock(&inode->i_lock); 5893 return ret; 5894 } 5895 5896 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, 5897 size_t pgbase, size_t acl_len, 5898 enum nfs4_acl_type type) 5899 { 5900 struct nfs4_cached_acl *acl; 5901 size_t buflen = sizeof(*acl) + acl_len; 5902 5903 if (buflen <= PAGE_SIZE) { 5904 acl = kmalloc(buflen, GFP_KERNEL); 5905 if (acl == NULL) 5906 goto out; 5907 acl->cached = 1; 5908 _copy_from_pages(acl->data, pages, pgbase, acl_len); 5909 } else { 5910 acl = kmalloc(sizeof(*acl), GFP_KERNEL); 5911 if (acl == NULL) 5912 goto out; 5913 acl->cached = 0; 5914 } 5915 acl->type = type; 5916 acl->len = acl_len; 5917 out: 5918 nfs4_set_cached_acl(inode, acl); 5919 } 5920 5921 /* 5922 * The getxattr API returns the required buffer length when called with a 5923 * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating 5924 * the required buf. On a NULL buf, we send a page of data to the server 5925 * guessing that the ACL request can be serviced by a page. If so, we cache 5926 * up to the page of ACL data, and the 2nd call to getxattr is serviced by 5927 * the cache. If not so, we throw away the page, and cache the required 5928 * length. The next getxattr call will then produce another round trip to 5929 * the server, this time with the input buf of the required size. 5930 */ 5931 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, 5932 size_t buflen, enum nfs4_acl_type type) 5933 { 5934 struct page **pages; 5935 struct nfs_getaclargs args = { 5936 .fh = NFS_FH(inode), 5937 .acl_type = type, 5938 .acl_len = buflen, 5939 }; 5940 struct nfs_getaclres res = { 5941 .acl_type = type, 5942 .acl_len = buflen, 5943 }; 5944 struct rpc_message msg = { 5945 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], 5946 .rpc_argp = &args, 5947 .rpc_resp = &res, 5948 }; 5949 unsigned int npages; 5950 int ret = -ENOMEM, i; 5951 struct nfs_server *server = NFS_SERVER(inode); 5952 5953 if (buflen == 0) 5954 buflen = server->rsize; 5955 5956 npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1; 5957 pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 5958 if (!pages) 5959 return -ENOMEM; 5960 5961 args.acl_pages = pages; 5962 5963 for (i = 0; i < npages; i++) { 5964 pages[i] = alloc_page(GFP_KERNEL); 5965 if (!pages[i]) 5966 goto out_free; 5967 } 5968 5969 /* for decoding across pages */ 5970 res.acl_scratch = alloc_page(GFP_KERNEL); 5971 if (!res.acl_scratch) 5972 goto out_free; 5973 5974 args.acl_len = npages * PAGE_SIZE; 5975 5976 dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n", 5977 __func__, buf, buflen, npages, args.acl_len); 5978 ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), 5979 &msg, &args.seq_args, &res.seq_res, 0); 5980 if (ret) 5981 goto out_free; 5982 5983 /* Handle the case where the passed-in buffer is too short */ 5984 if (res.acl_flags & NFS4_ACL_TRUNC) { 5985 /* Did the user only issue a request for the acl length? */ 5986 if (buf == NULL) 5987 goto out_ok; 5988 ret = -ERANGE; 5989 goto out_free; 5990 } 5991 nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len, 5992 type); 5993 if (buf) { 5994 if (res.acl_len > buflen) { 5995 ret = -ERANGE; 5996 goto out_free; 5997 } 5998 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len); 5999 } 6000 out_ok: 6001 ret = res.acl_len; 6002 out_free: 6003 while (--i >= 0) 6004 __free_page(pages[i]); 6005 if (res.acl_scratch) 6006 __free_page(res.acl_scratch); 6007 kfree(pages); 6008 return ret; 6009 } 6010 6011 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, 6012 size_t buflen, enum nfs4_acl_type type) 6013 { 6014 struct nfs4_exception exception = { 6015 .interruptible = true, 6016 }; 6017 ssize_t ret; 6018 do { 6019 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type); 6020 trace_nfs4_get_acl(inode, ret); 6021 if (ret >= 0) 6022 break; 6023 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception); 6024 } while (exception.retry); 6025 return ret; 6026 } 6027 6028 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen, 6029 enum nfs4_acl_type type) 6030 { 6031 struct nfs_server *server = NFS_SERVER(inode); 6032 int ret; 6033 6034 if (!nfs4_server_supports_acls(server, type)) 6035 return -EOPNOTSUPP; 6036 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 6037 if (ret < 0) 6038 return ret; 6039 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL) 6040 nfs_zap_acl_cache(inode); 6041 ret = nfs4_read_cached_acl(inode, buf, buflen, type); 6042 if (ret != -ENOENT) 6043 /* -ENOENT is returned if there is no ACL or if there is an ACL 6044 * but no cached acl data, just the acl length */ 6045 return ret; 6046 return nfs4_get_acl_uncached(inode, buf, buflen, type); 6047 } 6048 6049 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, 6050 size_t buflen, enum nfs4_acl_type type) 6051 { 6052 struct nfs_server *server = NFS_SERVER(inode); 6053 struct page *pages[NFS4ACL_MAXPAGES]; 6054 struct nfs_setaclargs arg = { 6055 .fh = NFS_FH(inode), 6056 .acl_type = type, 6057 .acl_len = buflen, 6058 .acl_pages = pages, 6059 }; 6060 struct nfs_setaclres res; 6061 struct rpc_message msg = { 6062 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], 6063 .rpc_argp = &arg, 6064 .rpc_resp = &res, 6065 }; 6066 unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); 6067 int ret, i; 6068 6069 /* You can't remove system.nfs4_acl: */ 6070 if (buflen == 0) 6071 return -EINVAL; 6072 if (!nfs4_server_supports_acls(server, type)) 6073 return -EOPNOTSUPP; 6074 if (npages > ARRAY_SIZE(pages)) 6075 return -ERANGE; 6076 i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages); 6077 if (i < 0) 6078 return i; 6079 nfs4_inode_make_writeable(inode); 6080 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6081 6082 /* 6083 * Free each page after tx, so the only ref left is 6084 * held by the network stack 6085 */ 6086 for (; i > 0; i--) 6087 put_page(pages[i-1]); 6088 6089 /* 6090 * Acl update can result in inode attribute update. 6091 * so mark the attribute cache invalid. 6092 */ 6093 spin_lock(&inode->i_lock); 6094 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE | 6095 NFS_INO_INVALID_CTIME | 6096 NFS_INO_REVAL_FORCED); 6097 spin_unlock(&inode->i_lock); 6098 nfs_access_zap_cache(inode); 6099 nfs_zap_acl_cache(inode); 6100 return ret; 6101 } 6102 6103 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, 6104 size_t buflen, enum nfs4_acl_type type) 6105 { 6106 struct nfs4_exception exception = { }; 6107 int err; 6108 do { 6109 err = __nfs4_proc_set_acl(inode, buf, buflen, type); 6110 trace_nfs4_set_acl(inode, err); 6111 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) { 6112 /* 6113 * no need to retry since the kernel 6114 * isn't involved in encoding the ACEs. 6115 */ 6116 err = -EINVAL; 6117 break; 6118 } 6119 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6120 &exception); 6121 } while (exception.retry); 6122 return err; 6123 } 6124 6125 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 6126 static int _nfs4_get_security_label(struct inode *inode, void *buf, 6127 size_t buflen) 6128 { 6129 struct nfs_server *server = NFS_SERVER(inode); 6130 struct nfs4_label label = {0, 0, buflen, buf}; 6131 6132 u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6133 struct nfs_fattr fattr = { 6134 .label = &label, 6135 }; 6136 struct nfs4_getattr_arg arg = { 6137 .fh = NFS_FH(inode), 6138 .bitmask = bitmask, 6139 }; 6140 struct nfs4_getattr_res res = { 6141 .fattr = &fattr, 6142 .server = server, 6143 }; 6144 struct rpc_message msg = { 6145 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], 6146 .rpc_argp = &arg, 6147 .rpc_resp = &res, 6148 }; 6149 int ret; 6150 6151 nfs_fattr_init(&fattr); 6152 6153 ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0); 6154 if (ret) 6155 return ret; 6156 if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL)) 6157 return -ENOENT; 6158 return label.len; 6159 } 6160 6161 static int nfs4_get_security_label(struct inode *inode, void *buf, 6162 size_t buflen) 6163 { 6164 struct nfs4_exception exception = { 6165 .interruptible = true, 6166 }; 6167 int err; 6168 6169 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6170 return -EOPNOTSUPP; 6171 6172 do { 6173 err = _nfs4_get_security_label(inode, buf, buflen); 6174 trace_nfs4_get_security_label(inode, err); 6175 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6176 &exception); 6177 } while (exception.retry); 6178 return err; 6179 } 6180 6181 static int _nfs4_do_set_security_label(struct inode *inode, 6182 struct nfs4_label *ilabel, 6183 struct nfs_fattr *fattr) 6184 { 6185 6186 struct iattr sattr = {0}; 6187 struct nfs_server *server = NFS_SERVER(inode); 6188 const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL }; 6189 struct nfs_setattrargs arg = { 6190 .fh = NFS_FH(inode), 6191 .iap = &sattr, 6192 .server = server, 6193 .bitmask = bitmask, 6194 .label = ilabel, 6195 }; 6196 struct nfs_setattrres res = { 6197 .fattr = fattr, 6198 .server = server, 6199 }; 6200 struct rpc_message msg = { 6201 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], 6202 .rpc_argp = &arg, 6203 .rpc_resp = &res, 6204 }; 6205 int status; 6206 6207 nfs4_stateid_copy(&arg.stateid, &zero_stateid); 6208 6209 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6210 if (status) 6211 dprintk("%s failed: %d\n", __func__, status); 6212 6213 return status; 6214 } 6215 6216 static int nfs4_do_set_security_label(struct inode *inode, 6217 struct nfs4_label *ilabel, 6218 struct nfs_fattr *fattr) 6219 { 6220 struct nfs4_exception exception = { }; 6221 int err; 6222 6223 do { 6224 err = _nfs4_do_set_security_label(inode, ilabel, fattr); 6225 trace_nfs4_set_security_label(inode, err); 6226 err = nfs4_handle_exception(NFS_SERVER(inode), err, 6227 &exception); 6228 } while (exception.retry); 6229 return err; 6230 } 6231 6232 static int 6233 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen) 6234 { 6235 struct nfs4_label ilabel = {0, 0, buflen, (char *)buf }; 6236 struct nfs_fattr *fattr; 6237 int status; 6238 6239 if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) 6240 return -EOPNOTSUPP; 6241 6242 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 6243 if (fattr == NULL) 6244 return -ENOMEM; 6245 6246 status = nfs4_do_set_security_label(inode, &ilabel, fattr); 6247 if (status == 0) 6248 nfs_setsecurity(inode, fattr); 6249 6250 return status; 6251 } 6252 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 6253 6254 6255 static void nfs4_init_boot_verifier(const struct nfs_client *clp, 6256 nfs4_verifier *bootverf) 6257 { 6258 __be32 verf[2]; 6259 6260 if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { 6261 /* An impossible timestamp guarantees this value 6262 * will never match a generated boot time. */ 6263 verf[0] = cpu_to_be32(U32_MAX); 6264 verf[1] = cpu_to_be32(U32_MAX); 6265 } else { 6266 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6267 u64 ns = ktime_to_ns(nn->boot_time); 6268 6269 verf[0] = cpu_to_be32(ns >> 32); 6270 verf[1] = cpu_to_be32(ns); 6271 } 6272 memcpy(bootverf->data, verf, sizeof(bootverf->data)); 6273 } 6274 6275 static size_t 6276 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen) 6277 { 6278 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 6279 struct nfs_netns_client *nn_clp = nn->nfs_client; 6280 const char *id; 6281 6282 buf[0] = '\0'; 6283 6284 if (nn_clp) { 6285 rcu_read_lock(); 6286 id = rcu_dereference(nn_clp->identifier); 6287 if (id) 6288 strscpy(buf, id, buflen); 6289 rcu_read_unlock(); 6290 } 6291 6292 if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0') 6293 strscpy(buf, nfs4_client_id_uniquifier, buflen); 6294 6295 return strlen(buf); 6296 } 6297 6298 static int 6299 nfs4_init_nonuniform_client_string(struct nfs_client *clp) 6300 { 6301 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6302 size_t buflen; 6303 size_t len; 6304 char *str; 6305 6306 if (clp->cl_owner_id != NULL) 6307 return 0; 6308 6309 rcu_read_lock(); 6310 len = 14 + 6311 strlen(clp->cl_rpcclient->cl_nodename) + 6312 1 + 6313 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) + 6314 1; 6315 rcu_read_unlock(); 6316 6317 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6318 if (buflen) 6319 len += buflen + 1; 6320 6321 if (len > NFS4_OPAQUE_LIMIT + 1) 6322 return -EINVAL; 6323 6324 /* 6325 * Since this string is allocated at mount time, and held until the 6326 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6327 * about a memory-reclaim deadlock. 6328 */ 6329 str = kmalloc(len, GFP_KERNEL); 6330 if (!str) 6331 return -ENOMEM; 6332 6333 rcu_read_lock(); 6334 if (buflen) 6335 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s", 6336 clp->cl_rpcclient->cl_nodename, buf, 6337 rpc_peeraddr2str(clp->cl_rpcclient, 6338 RPC_DISPLAY_ADDR)); 6339 else 6340 scnprintf(str, len, "Linux NFSv4.0 %s/%s", 6341 clp->cl_rpcclient->cl_nodename, 6342 rpc_peeraddr2str(clp->cl_rpcclient, 6343 RPC_DISPLAY_ADDR)); 6344 rcu_read_unlock(); 6345 6346 clp->cl_owner_id = str; 6347 return 0; 6348 } 6349 6350 static int 6351 nfs4_init_uniform_client_string(struct nfs_client *clp) 6352 { 6353 char buf[NFS4_CLIENT_ID_UNIQ_LEN]; 6354 size_t buflen; 6355 size_t len; 6356 char *str; 6357 6358 if (clp->cl_owner_id != NULL) 6359 return 0; 6360 6361 len = 10 + 10 + 1 + 10 + 1 + 6362 strlen(clp->cl_rpcclient->cl_nodename) + 1; 6363 6364 buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf)); 6365 if (buflen) 6366 len += buflen + 1; 6367 6368 if (len > NFS4_OPAQUE_LIMIT + 1) 6369 return -EINVAL; 6370 6371 /* 6372 * Since this string is allocated at mount time, and held until the 6373 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying 6374 * about a memory-reclaim deadlock. 6375 */ 6376 str = kmalloc(len, GFP_KERNEL); 6377 if (!str) 6378 return -ENOMEM; 6379 6380 if (buflen) 6381 scnprintf(str, len, "Linux NFSv%u.%u %s/%s", 6382 clp->rpc_ops->version, clp->cl_minorversion, 6383 buf, clp->cl_rpcclient->cl_nodename); 6384 else 6385 scnprintf(str, len, "Linux NFSv%u.%u %s", 6386 clp->rpc_ops->version, clp->cl_minorversion, 6387 clp->cl_rpcclient->cl_nodename); 6388 clp->cl_owner_id = str; 6389 return 0; 6390 } 6391 6392 /* 6393 * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback 6394 * services. Advertise one based on the address family of the 6395 * clientaddr. 6396 */ 6397 static unsigned int 6398 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len) 6399 { 6400 if (strchr(clp->cl_ipaddr, ':') != NULL) 6401 return scnprintf(buf, len, "tcp6"); 6402 else 6403 return scnprintf(buf, len, "tcp"); 6404 } 6405 6406 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata) 6407 { 6408 struct nfs4_setclientid *sc = calldata; 6409 6410 if (task->tk_status == 0) 6411 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred); 6412 } 6413 6414 static const struct rpc_call_ops nfs4_setclientid_ops = { 6415 .rpc_call_done = nfs4_setclientid_done, 6416 }; 6417 6418 /** 6419 * nfs4_proc_setclientid - Negotiate client ID 6420 * @clp: state data structure 6421 * @program: RPC program for NFSv4 callback service 6422 * @port: IP port number for NFS4 callback service 6423 * @cred: credential to use for this call 6424 * @res: where to place the result 6425 * 6426 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6427 */ 6428 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, 6429 unsigned short port, const struct cred *cred, 6430 struct nfs4_setclientid_res *res) 6431 { 6432 nfs4_verifier sc_verifier; 6433 struct nfs4_setclientid setclientid = { 6434 .sc_verifier = &sc_verifier, 6435 .sc_prog = program, 6436 .sc_clnt = clp, 6437 }; 6438 struct rpc_message msg = { 6439 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], 6440 .rpc_argp = &setclientid, 6441 .rpc_resp = res, 6442 .rpc_cred = cred, 6443 }; 6444 struct rpc_task_setup task_setup_data = { 6445 .rpc_client = clp->cl_rpcclient, 6446 .rpc_message = &msg, 6447 .callback_ops = &nfs4_setclientid_ops, 6448 .callback_data = &setclientid, 6449 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 6450 }; 6451 unsigned long now = jiffies; 6452 int status; 6453 6454 /* nfs_client_id4 */ 6455 nfs4_init_boot_verifier(clp, &sc_verifier); 6456 6457 if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags)) 6458 status = nfs4_init_uniform_client_string(clp); 6459 else 6460 status = nfs4_init_nonuniform_client_string(clp); 6461 6462 if (status) 6463 goto out; 6464 6465 /* cb_client4 */ 6466 setclientid.sc_netid_len = 6467 nfs4_init_callback_netid(clp, 6468 setclientid.sc_netid, 6469 sizeof(setclientid.sc_netid)); 6470 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, 6471 sizeof(setclientid.sc_uaddr), "%s.%u.%u", 6472 clp->cl_ipaddr, port >> 8, port & 255); 6473 6474 dprintk("NFS call setclientid auth=%s, '%s'\n", 6475 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6476 clp->cl_owner_id); 6477 6478 status = nfs4_call_sync_custom(&task_setup_data); 6479 if (setclientid.sc_cred) { 6480 kfree(clp->cl_acceptor); 6481 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred); 6482 put_rpccred(setclientid.sc_cred); 6483 } 6484 6485 if (status == 0) 6486 do_renew_lease(clp, now); 6487 out: 6488 trace_nfs4_setclientid(clp, status); 6489 dprintk("NFS reply setclientid: %d\n", status); 6490 return status; 6491 } 6492 6493 /** 6494 * nfs4_proc_setclientid_confirm - Confirm client ID 6495 * @clp: state data structure 6496 * @arg: result of a previous SETCLIENTID 6497 * @cred: credential to use for this call 6498 * 6499 * Returns zero, a negative errno, or a negative NFS4ERR status code. 6500 */ 6501 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, 6502 struct nfs4_setclientid_res *arg, 6503 const struct cred *cred) 6504 { 6505 struct rpc_message msg = { 6506 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], 6507 .rpc_argp = arg, 6508 .rpc_cred = cred, 6509 }; 6510 int status; 6511 6512 dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n", 6513 clp->cl_rpcclient->cl_auth->au_ops->au_name, 6514 clp->cl_clientid); 6515 status = rpc_call_sync(clp->cl_rpcclient, &msg, 6516 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 6517 trace_nfs4_setclientid_confirm(clp, status); 6518 dprintk("NFS reply setclientid_confirm: %d\n", status); 6519 return status; 6520 } 6521 6522 struct nfs4_delegreturndata { 6523 struct nfs4_delegreturnargs args; 6524 struct nfs4_delegreturnres res; 6525 struct nfs_fh fh; 6526 nfs4_stateid stateid; 6527 unsigned long timestamp; 6528 struct { 6529 struct nfs4_layoutreturn_args arg; 6530 struct nfs4_layoutreturn_res res; 6531 struct nfs4_xdr_opaque_data ld_private; 6532 u32 roc_barrier; 6533 bool roc; 6534 } lr; 6535 struct nfs_fattr fattr; 6536 int rpc_status; 6537 struct inode *inode; 6538 }; 6539 6540 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) 6541 { 6542 struct nfs4_delegreturndata *data = calldata; 6543 struct nfs4_exception exception = { 6544 .inode = data->inode, 6545 .stateid = &data->stateid, 6546 .task_is_privileged = data->args.seq_args.sa_privileged, 6547 }; 6548 6549 if (!nfs4_sequence_done(task, &data->res.seq_res)) 6550 return; 6551 6552 trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status); 6553 6554 /* Handle Layoutreturn errors */ 6555 if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res, 6556 &data->res.lr_ret) == -EAGAIN) 6557 goto out_restart; 6558 6559 switch (task->tk_status) { 6560 case 0: 6561 renew_lease(data->res.server, data->timestamp); 6562 break; 6563 case -NFS4ERR_ADMIN_REVOKED: 6564 case -NFS4ERR_DELEG_REVOKED: 6565 case -NFS4ERR_EXPIRED: 6566 nfs4_free_revoked_stateid(data->res.server, 6567 data->args.stateid, 6568 task->tk_msg.rpc_cred); 6569 fallthrough; 6570 case -NFS4ERR_BAD_STATEID: 6571 case -NFS4ERR_STALE_STATEID: 6572 case -ETIMEDOUT: 6573 task->tk_status = 0; 6574 break; 6575 case -NFS4ERR_OLD_STATEID: 6576 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode)) 6577 nfs4_stateid_seqid_inc(&data->stateid); 6578 if (data->args.bitmask) { 6579 data->args.bitmask = NULL; 6580 data->res.fattr = NULL; 6581 } 6582 goto out_restart; 6583 case -NFS4ERR_ACCESS: 6584 if (data->args.bitmask) { 6585 data->args.bitmask = NULL; 6586 data->res.fattr = NULL; 6587 goto out_restart; 6588 } 6589 fallthrough; 6590 default: 6591 task->tk_status = nfs4_async_handle_exception(task, 6592 data->res.server, task->tk_status, 6593 &exception); 6594 if (exception.retry) 6595 goto out_restart; 6596 } 6597 nfs_delegation_mark_returned(data->inode, data->args.stateid); 6598 data->rpc_status = task->tk_status; 6599 return; 6600 out_restart: 6601 task->tk_status = 0; 6602 rpc_restart_call_prepare(task); 6603 } 6604 6605 static void nfs4_delegreturn_release(void *calldata) 6606 { 6607 struct nfs4_delegreturndata *data = calldata; 6608 struct inode *inode = data->inode; 6609 6610 if (data->lr.roc) 6611 pnfs_roc_release(&data->lr.arg, &data->lr.res, 6612 data->res.lr_ret); 6613 if (inode) { 6614 nfs4_fattr_set_prechange(&data->fattr, 6615 inode_peek_iversion_raw(inode)); 6616 nfs_refresh_inode(inode, &data->fattr); 6617 nfs_iput_and_deactive(inode); 6618 } 6619 kfree(calldata); 6620 } 6621 6622 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data) 6623 { 6624 struct nfs4_delegreturndata *d_data; 6625 struct pnfs_layout_hdr *lo; 6626 6627 d_data = data; 6628 6629 if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) { 6630 nfs4_sequence_done(task, &d_data->res.seq_res); 6631 return; 6632 } 6633 6634 lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL; 6635 if (lo && !pnfs_layout_is_valid(lo)) { 6636 d_data->args.lr_args = NULL; 6637 d_data->res.lr_res = NULL; 6638 } 6639 6640 nfs4_setup_sequence(d_data->res.server->nfs_client, 6641 &d_data->args.seq_args, 6642 &d_data->res.seq_res, 6643 task); 6644 } 6645 6646 static const struct rpc_call_ops nfs4_delegreturn_ops = { 6647 .rpc_call_prepare = nfs4_delegreturn_prepare, 6648 .rpc_call_done = nfs4_delegreturn_done, 6649 .rpc_release = nfs4_delegreturn_release, 6650 }; 6651 6652 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6653 { 6654 struct nfs4_delegreturndata *data; 6655 struct nfs_server *server = NFS_SERVER(inode); 6656 struct rpc_task *task; 6657 struct rpc_message msg = { 6658 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], 6659 .rpc_cred = cred, 6660 }; 6661 struct rpc_task_setup task_setup_data = { 6662 .rpc_client = server->client, 6663 .rpc_message = &msg, 6664 .callback_ops = &nfs4_delegreturn_ops, 6665 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT, 6666 }; 6667 int status = 0; 6668 6669 if (nfs_server_capable(inode, NFS_CAP_MOVEABLE)) 6670 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6671 6672 data = kzalloc(sizeof(*data), GFP_KERNEL); 6673 if (data == NULL) 6674 return -ENOMEM; 6675 6676 nfs4_state_protect(server->nfs_client, 6677 NFS_SP4_MACH_CRED_CLEANUP, 6678 &task_setup_data.rpc_client, &msg); 6679 6680 data->args.fhandle = &data->fh; 6681 data->args.stateid = &data->stateid; 6682 nfs4_bitmask_set(data->args.bitmask_store, 6683 server->cache_consistency_bitmask, inode, 0); 6684 data->args.bitmask = data->args.bitmask_store; 6685 nfs_copy_fh(&data->fh, NFS_FH(inode)); 6686 nfs4_stateid_copy(&data->stateid, stateid); 6687 data->res.fattr = &data->fattr; 6688 data->res.server = server; 6689 data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT; 6690 data->lr.arg.ld_private = &data->lr.ld_private; 6691 nfs_fattr_init(data->res.fattr); 6692 data->timestamp = jiffies; 6693 data->rpc_status = 0; 6694 data->inode = nfs_igrab_and_active(inode); 6695 if (data->inode || issync) { 6696 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, 6697 cred); 6698 if (data->lr.roc) { 6699 data->args.lr_args = &data->lr.arg; 6700 data->res.lr_res = &data->lr.res; 6701 } 6702 } 6703 6704 if (!data->inode) 6705 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6706 1); 6707 else 6708 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 6709 0); 6710 task_setup_data.callback_data = data; 6711 msg.rpc_argp = &data->args; 6712 msg.rpc_resp = &data->res; 6713 task = rpc_run_task(&task_setup_data); 6714 if (IS_ERR(task)) 6715 return PTR_ERR(task); 6716 if (!issync) 6717 goto out; 6718 status = rpc_wait_for_completion_task(task); 6719 if (status != 0) 6720 goto out; 6721 status = data->rpc_status; 6722 out: 6723 rpc_put_task(task); 6724 return status; 6725 } 6726 6727 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync) 6728 { 6729 struct nfs_server *server = NFS_SERVER(inode); 6730 struct nfs4_exception exception = { }; 6731 int err; 6732 do { 6733 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync); 6734 trace_nfs4_delegreturn(inode, stateid, err); 6735 switch (err) { 6736 case -NFS4ERR_STALE_STATEID: 6737 case -NFS4ERR_EXPIRED: 6738 case 0: 6739 return 0; 6740 } 6741 err = nfs4_handle_exception(server, err, &exception); 6742 } while (exception.retry); 6743 return err; 6744 } 6745 6746 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6747 { 6748 struct inode *inode = state->inode; 6749 struct nfs_server *server = NFS_SERVER(inode); 6750 struct nfs_client *clp = server->nfs_client; 6751 struct nfs_lockt_args arg = { 6752 .fh = NFS_FH(inode), 6753 .fl = request, 6754 }; 6755 struct nfs_lockt_res res = { 6756 .denied = request, 6757 }; 6758 struct rpc_message msg = { 6759 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], 6760 .rpc_argp = &arg, 6761 .rpc_resp = &res, 6762 .rpc_cred = state->owner->so_cred, 6763 }; 6764 struct nfs4_lock_state *lsp; 6765 int status; 6766 6767 arg.lock_owner.clientid = clp->cl_clientid; 6768 status = nfs4_set_lock_state(state, request); 6769 if (status != 0) 6770 goto out; 6771 lsp = request->fl_u.nfs4_fl.owner; 6772 arg.lock_owner.id = lsp->ls_seqid.owner_id; 6773 arg.lock_owner.s_dev = server->s_dev; 6774 status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1); 6775 switch (status) { 6776 case 0: 6777 request->fl_type = F_UNLCK; 6778 break; 6779 case -NFS4ERR_DENIED: 6780 status = 0; 6781 } 6782 request->fl_ops->fl_release_private(request); 6783 request->fl_ops = NULL; 6784 out: 6785 return status; 6786 } 6787 6788 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) 6789 { 6790 struct nfs4_exception exception = { 6791 .interruptible = true, 6792 }; 6793 int err; 6794 6795 do { 6796 err = _nfs4_proc_getlk(state, cmd, request); 6797 trace_nfs4_get_lock(request, state, cmd, err); 6798 err = nfs4_handle_exception(NFS_SERVER(state->inode), err, 6799 &exception); 6800 } while (exception.retry); 6801 return err; 6802 } 6803 6804 /* 6805 * Update the seqid of a lock stateid after receiving 6806 * NFS4ERR_OLD_STATEID 6807 */ 6808 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst, 6809 struct nfs4_lock_state *lsp) 6810 { 6811 struct nfs4_state *state = lsp->ls_state; 6812 bool ret = false; 6813 6814 spin_lock(&state->state_lock); 6815 if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid)) 6816 goto out; 6817 if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst)) 6818 nfs4_stateid_seqid_inc(dst); 6819 else 6820 dst->seqid = lsp->ls_stateid.seqid; 6821 ret = true; 6822 out: 6823 spin_unlock(&state->state_lock); 6824 return ret; 6825 } 6826 6827 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst, 6828 struct nfs4_lock_state *lsp) 6829 { 6830 struct nfs4_state *state = lsp->ls_state; 6831 bool ret; 6832 6833 spin_lock(&state->state_lock); 6834 ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid); 6835 nfs4_stateid_copy(dst, &lsp->ls_stateid); 6836 spin_unlock(&state->state_lock); 6837 return ret; 6838 } 6839 6840 struct nfs4_unlockdata { 6841 struct nfs_locku_args arg; 6842 struct nfs_locku_res res; 6843 struct nfs4_lock_state *lsp; 6844 struct nfs_open_context *ctx; 6845 struct nfs_lock_context *l_ctx; 6846 struct file_lock fl; 6847 struct nfs_server *server; 6848 unsigned long timestamp; 6849 }; 6850 6851 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, 6852 struct nfs_open_context *ctx, 6853 struct nfs4_lock_state *lsp, 6854 struct nfs_seqid *seqid) 6855 { 6856 struct nfs4_unlockdata *p; 6857 struct nfs4_state *state = lsp->ls_state; 6858 struct inode *inode = state->inode; 6859 6860 p = kzalloc(sizeof(*p), GFP_KERNEL); 6861 if (p == NULL) 6862 return NULL; 6863 p->arg.fh = NFS_FH(inode); 6864 p->arg.fl = &p->fl; 6865 p->arg.seqid = seqid; 6866 p->res.seqid = seqid; 6867 p->lsp = lsp; 6868 /* Ensure we don't close file until we're done freeing locks! */ 6869 p->ctx = get_nfs_open_context(ctx); 6870 p->l_ctx = nfs_get_lock_context(ctx); 6871 locks_init_lock(&p->fl); 6872 locks_copy_lock(&p->fl, fl); 6873 p->server = NFS_SERVER(inode); 6874 spin_lock(&state->state_lock); 6875 nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid); 6876 spin_unlock(&state->state_lock); 6877 return p; 6878 } 6879 6880 static void nfs4_locku_release_calldata(void *data) 6881 { 6882 struct nfs4_unlockdata *calldata = data; 6883 nfs_free_seqid(calldata->arg.seqid); 6884 nfs4_put_lock_state(calldata->lsp); 6885 nfs_put_lock_context(calldata->l_ctx); 6886 put_nfs_open_context(calldata->ctx); 6887 kfree(calldata); 6888 } 6889 6890 static void nfs4_locku_done(struct rpc_task *task, void *data) 6891 { 6892 struct nfs4_unlockdata *calldata = data; 6893 struct nfs4_exception exception = { 6894 .inode = calldata->lsp->ls_state->inode, 6895 .stateid = &calldata->arg.stateid, 6896 }; 6897 6898 if (!nfs4_sequence_done(task, &calldata->res.seq_res)) 6899 return; 6900 switch (task->tk_status) { 6901 case 0: 6902 renew_lease(calldata->server, calldata->timestamp); 6903 locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl); 6904 if (nfs4_update_lock_stateid(calldata->lsp, 6905 &calldata->res.stateid)) 6906 break; 6907 fallthrough; 6908 case -NFS4ERR_ADMIN_REVOKED: 6909 case -NFS4ERR_EXPIRED: 6910 nfs4_free_revoked_stateid(calldata->server, 6911 &calldata->arg.stateid, 6912 task->tk_msg.rpc_cred); 6913 fallthrough; 6914 case -NFS4ERR_BAD_STATEID: 6915 case -NFS4ERR_STALE_STATEID: 6916 if (nfs4_sync_lock_stateid(&calldata->arg.stateid, 6917 calldata->lsp)) 6918 rpc_restart_call_prepare(task); 6919 break; 6920 case -NFS4ERR_OLD_STATEID: 6921 if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid, 6922 calldata->lsp)) 6923 rpc_restart_call_prepare(task); 6924 break; 6925 default: 6926 task->tk_status = nfs4_async_handle_exception(task, 6927 calldata->server, task->tk_status, 6928 &exception); 6929 if (exception.retry) 6930 rpc_restart_call_prepare(task); 6931 } 6932 nfs_release_seqid(calldata->arg.seqid); 6933 } 6934 6935 static void nfs4_locku_prepare(struct rpc_task *task, void *data) 6936 { 6937 struct nfs4_unlockdata *calldata = data; 6938 6939 if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) && 6940 nfs_async_iocounter_wait(task, calldata->l_ctx)) 6941 return; 6942 6943 if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) 6944 goto out_wait; 6945 if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) { 6946 /* Note: exit _without_ running nfs4_locku_done */ 6947 goto out_no_action; 6948 } 6949 calldata->timestamp = jiffies; 6950 if (nfs4_setup_sequence(calldata->server->nfs_client, 6951 &calldata->arg.seq_args, 6952 &calldata->res.seq_res, 6953 task) != 0) 6954 nfs_release_seqid(calldata->arg.seqid); 6955 return; 6956 out_no_action: 6957 task->tk_action = NULL; 6958 out_wait: 6959 nfs4_sequence_done(task, &calldata->res.seq_res); 6960 } 6961 6962 static const struct rpc_call_ops nfs4_locku_ops = { 6963 .rpc_call_prepare = nfs4_locku_prepare, 6964 .rpc_call_done = nfs4_locku_done, 6965 .rpc_release = nfs4_locku_release_calldata, 6966 }; 6967 6968 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, 6969 struct nfs_open_context *ctx, 6970 struct nfs4_lock_state *lsp, 6971 struct nfs_seqid *seqid) 6972 { 6973 struct nfs4_unlockdata *data; 6974 struct rpc_message msg = { 6975 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], 6976 .rpc_cred = ctx->cred, 6977 }; 6978 struct rpc_task_setup task_setup_data = { 6979 .rpc_client = NFS_CLIENT(lsp->ls_state->inode), 6980 .rpc_message = &msg, 6981 .callback_ops = &nfs4_locku_ops, 6982 .workqueue = nfsiod_workqueue, 6983 .flags = RPC_TASK_ASYNC, 6984 }; 6985 6986 if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE)) 6987 task_setup_data.flags |= RPC_TASK_MOVEABLE; 6988 6989 nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client, 6990 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg); 6991 6992 /* Ensure this is an unlock - when canceling a lock, the 6993 * canceled lock is passed in, and it won't be an unlock. 6994 */ 6995 fl->fl_type = F_UNLCK; 6996 if (fl->fl_flags & FL_CLOSE) 6997 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags); 6998 6999 data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); 7000 if (data == NULL) { 7001 nfs_free_seqid(seqid); 7002 return ERR_PTR(-ENOMEM); 7003 } 7004 7005 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0); 7006 msg.rpc_argp = &data->arg; 7007 msg.rpc_resp = &data->res; 7008 task_setup_data.callback_data = data; 7009 return rpc_run_task(&task_setup_data); 7010 } 7011 7012 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) 7013 { 7014 struct inode *inode = state->inode; 7015 struct nfs4_state_owner *sp = state->owner; 7016 struct nfs_inode *nfsi = NFS_I(inode); 7017 struct nfs_seqid *seqid; 7018 struct nfs4_lock_state *lsp; 7019 struct rpc_task *task; 7020 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7021 int status = 0; 7022 unsigned char fl_flags = request->fl_flags; 7023 7024 status = nfs4_set_lock_state(state, request); 7025 /* Unlock _before_ we do the RPC call */ 7026 request->fl_flags |= FL_EXISTS; 7027 /* Exclude nfs_delegation_claim_locks() */ 7028 mutex_lock(&sp->so_delegreturn_mutex); 7029 /* Exclude nfs4_reclaim_open_stateid() - note nesting! */ 7030 down_read(&nfsi->rwsem); 7031 if (locks_lock_inode_wait(inode, request) == -ENOENT) { 7032 up_read(&nfsi->rwsem); 7033 mutex_unlock(&sp->so_delegreturn_mutex); 7034 goto out; 7035 } 7036 lsp = request->fl_u.nfs4_fl.owner; 7037 set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags); 7038 up_read(&nfsi->rwsem); 7039 mutex_unlock(&sp->so_delegreturn_mutex); 7040 if (status != 0) 7041 goto out; 7042 /* Is this a delegated lock? */ 7043 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0) 7044 goto out; 7045 alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid; 7046 seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL); 7047 status = -ENOMEM; 7048 if (IS_ERR(seqid)) 7049 goto out; 7050 task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid); 7051 status = PTR_ERR(task); 7052 if (IS_ERR(task)) 7053 goto out; 7054 status = rpc_wait_for_completion_task(task); 7055 rpc_put_task(task); 7056 out: 7057 request->fl_flags = fl_flags; 7058 trace_nfs4_unlock(request, state, F_SETLK, status); 7059 return status; 7060 } 7061 7062 struct nfs4_lockdata { 7063 struct nfs_lock_args arg; 7064 struct nfs_lock_res res; 7065 struct nfs4_lock_state *lsp; 7066 struct nfs_open_context *ctx; 7067 struct file_lock fl; 7068 unsigned long timestamp; 7069 int rpc_status; 7070 int cancelled; 7071 struct nfs_server *server; 7072 }; 7073 7074 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, 7075 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp, 7076 gfp_t gfp_mask) 7077 { 7078 struct nfs4_lockdata *p; 7079 struct inode *inode = lsp->ls_state->inode; 7080 struct nfs_server *server = NFS_SERVER(inode); 7081 struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 7082 7083 p = kzalloc(sizeof(*p), gfp_mask); 7084 if (p == NULL) 7085 return NULL; 7086 7087 p->arg.fh = NFS_FH(inode); 7088 p->arg.fl = &p->fl; 7089 p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask); 7090 if (IS_ERR(p->arg.open_seqid)) 7091 goto out_free; 7092 alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid; 7093 p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask); 7094 if (IS_ERR(p->arg.lock_seqid)) 7095 goto out_free_seqid; 7096 p->arg.lock_owner.clientid = server->nfs_client->cl_clientid; 7097 p->arg.lock_owner.id = lsp->ls_seqid.owner_id; 7098 p->arg.lock_owner.s_dev = server->s_dev; 7099 p->res.lock_seqid = p->arg.lock_seqid; 7100 p->lsp = lsp; 7101 p->server = server; 7102 p->ctx = get_nfs_open_context(ctx); 7103 locks_init_lock(&p->fl); 7104 locks_copy_lock(&p->fl, fl); 7105 return p; 7106 out_free_seqid: 7107 nfs_free_seqid(p->arg.open_seqid); 7108 out_free: 7109 kfree(p); 7110 return NULL; 7111 } 7112 7113 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) 7114 { 7115 struct nfs4_lockdata *data = calldata; 7116 struct nfs4_state *state = data->lsp->ls_state; 7117 7118 if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) 7119 goto out_wait; 7120 /* Do we need to do an open_to_lock_owner? */ 7121 if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) { 7122 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) { 7123 goto out_release_lock_seqid; 7124 } 7125 nfs4_stateid_copy(&data->arg.open_stateid, 7126 &state->open_stateid); 7127 data->arg.new_lock_owner = 1; 7128 data->res.open_seqid = data->arg.open_seqid; 7129 } else { 7130 data->arg.new_lock_owner = 0; 7131 nfs4_stateid_copy(&data->arg.lock_stateid, 7132 &data->lsp->ls_stateid); 7133 } 7134 if (!nfs4_valid_open_stateid(state)) { 7135 data->rpc_status = -EBADF; 7136 task->tk_action = NULL; 7137 goto out_release_open_seqid; 7138 } 7139 data->timestamp = jiffies; 7140 if (nfs4_setup_sequence(data->server->nfs_client, 7141 &data->arg.seq_args, 7142 &data->res.seq_res, 7143 task) == 0) 7144 return; 7145 out_release_open_seqid: 7146 nfs_release_seqid(data->arg.open_seqid); 7147 out_release_lock_seqid: 7148 nfs_release_seqid(data->arg.lock_seqid); 7149 out_wait: 7150 nfs4_sequence_done(task, &data->res.seq_res); 7151 dprintk("%s: ret = %d\n", __func__, data->rpc_status); 7152 } 7153 7154 static void nfs4_lock_done(struct rpc_task *task, void *calldata) 7155 { 7156 struct nfs4_lockdata *data = calldata; 7157 struct nfs4_lock_state *lsp = data->lsp; 7158 7159 if (!nfs4_sequence_done(task, &data->res.seq_res)) 7160 return; 7161 7162 data->rpc_status = task->tk_status; 7163 switch (task->tk_status) { 7164 case 0: 7165 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)), 7166 data->timestamp); 7167 if (data->arg.new_lock && !data->cancelled) { 7168 data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS); 7169 if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) 7170 goto out_restart; 7171 } 7172 if (data->arg.new_lock_owner != 0) { 7173 nfs_confirm_seqid(&lsp->ls_seqid, 0); 7174 nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid); 7175 set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags); 7176 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) 7177 goto out_restart; 7178 break; 7179 case -NFS4ERR_OLD_STATEID: 7180 if (data->arg.new_lock_owner != 0 && 7181 nfs4_refresh_open_old_stateid(&data->arg.open_stateid, 7182 lsp->ls_state)) 7183 goto out_restart; 7184 if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) 7185 goto out_restart; 7186 fallthrough; 7187 case -NFS4ERR_BAD_STATEID: 7188 case -NFS4ERR_STALE_STATEID: 7189 case -NFS4ERR_EXPIRED: 7190 if (data->arg.new_lock_owner != 0) { 7191 if (!nfs4_stateid_match(&data->arg.open_stateid, 7192 &lsp->ls_state->open_stateid)) 7193 goto out_restart; 7194 } else if (!nfs4_stateid_match(&data->arg.lock_stateid, 7195 &lsp->ls_stateid)) 7196 goto out_restart; 7197 } 7198 out_done: 7199 dprintk("%s: ret = %d!\n", __func__, data->rpc_status); 7200 return; 7201 out_restart: 7202 if (!data->cancelled) 7203 rpc_restart_call_prepare(task); 7204 goto out_done; 7205 } 7206 7207 static void nfs4_lock_release(void *calldata) 7208 { 7209 struct nfs4_lockdata *data = calldata; 7210 7211 nfs_free_seqid(data->arg.open_seqid); 7212 if (data->cancelled && data->rpc_status == 0) { 7213 struct rpc_task *task; 7214 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, 7215 data->arg.lock_seqid); 7216 if (!IS_ERR(task)) 7217 rpc_put_task_async(task); 7218 dprintk("%s: cancelling lock!\n", __func__); 7219 } else 7220 nfs_free_seqid(data->arg.lock_seqid); 7221 nfs4_put_lock_state(data->lsp); 7222 put_nfs_open_context(data->ctx); 7223 kfree(data); 7224 } 7225 7226 static const struct rpc_call_ops nfs4_lock_ops = { 7227 .rpc_call_prepare = nfs4_lock_prepare, 7228 .rpc_call_done = nfs4_lock_done, 7229 .rpc_release = nfs4_lock_release, 7230 }; 7231 7232 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error) 7233 { 7234 switch (error) { 7235 case -NFS4ERR_ADMIN_REVOKED: 7236 case -NFS4ERR_EXPIRED: 7237 case -NFS4ERR_BAD_STATEID: 7238 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7239 if (new_lock_owner != 0 || 7240 test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) 7241 nfs4_schedule_stateid_recovery(server, lsp->ls_state); 7242 break; 7243 case -NFS4ERR_STALE_STATEID: 7244 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED; 7245 nfs4_schedule_lease_recovery(server->nfs_client); 7246 } 7247 } 7248 7249 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type) 7250 { 7251 struct nfs4_lockdata *data; 7252 struct rpc_task *task; 7253 struct rpc_message msg = { 7254 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], 7255 .rpc_cred = state->owner->so_cred, 7256 }; 7257 struct rpc_task_setup task_setup_data = { 7258 .rpc_client = NFS_CLIENT(state->inode), 7259 .rpc_message = &msg, 7260 .callback_ops = &nfs4_lock_ops, 7261 .workqueue = nfsiod_workqueue, 7262 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF, 7263 }; 7264 int ret; 7265 7266 if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE)) 7267 task_setup_data.flags |= RPC_TASK_MOVEABLE; 7268 7269 data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file), 7270 fl->fl_u.nfs4_fl.owner, GFP_KERNEL); 7271 if (data == NULL) 7272 return -ENOMEM; 7273 if (IS_SETLKW(cmd)) 7274 data->arg.block = 1; 7275 nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 7276 recovery_type > NFS_LOCK_NEW); 7277 msg.rpc_argp = &data->arg; 7278 msg.rpc_resp = &data->res; 7279 task_setup_data.callback_data = data; 7280 if (recovery_type > NFS_LOCK_NEW) { 7281 if (recovery_type == NFS_LOCK_RECLAIM) 7282 data->arg.reclaim = NFS_LOCK_RECLAIM; 7283 } else 7284 data->arg.new_lock = 1; 7285 task = rpc_run_task(&task_setup_data); 7286 if (IS_ERR(task)) 7287 return PTR_ERR(task); 7288 ret = rpc_wait_for_completion_task(task); 7289 if (ret == 0) { 7290 ret = data->rpc_status; 7291 if (ret) 7292 nfs4_handle_setlk_error(data->server, data->lsp, 7293 data->arg.new_lock_owner, ret); 7294 } else 7295 data->cancelled = true; 7296 trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret); 7297 rpc_put_task(task); 7298 dprintk("%s: ret = %d\n", __func__, ret); 7299 return ret; 7300 } 7301 7302 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) 7303 { 7304 struct nfs_server *server = NFS_SERVER(state->inode); 7305 struct nfs4_exception exception = { 7306 .inode = state->inode, 7307 }; 7308 int err; 7309 7310 do { 7311 /* Cache the lock if possible... */ 7312 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7313 return 0; 7314 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM); 7315 if (err != -NFS4ERR_DELAY) 7316 break; 7317 nfs4_handle_exception(server, err, &exception); 7318 } while (exception.retry); 7319 return err; 7320 } 7321 7322 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) 7323 { 7324 struct nfs_server *server = NFS_SERVER(state->inode); 7325 struct nfs4_exception exception = { 7326 .inode = state->inode, 7327 }; 7328 int err; 7329 7330 err = nfs4_set_lock_state(state, request); 7331 if (err != 0) 7332 return err; 7333 if (!recover_lost_locks) { 7334 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags); 7335 return 0; 7336 } 7337 do { 7338 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) 7339 return 0; 7340 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED); 7341 switch (err) { 7342 default: 7343 goto out; 7344 case -NFS4ERR_GRACE: 7345 case -NFS4ERR_DELAY: 7346 nfs4_handle_exception(server, err, &exception); 7347 err = 0; 7348 } 7349 } while (exception.retry); 7350 out: 7351 return err; 7352 } 7353 7354 #if defined(CONFIG_NFS_V4_1) 7355 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request) 7356 { 7357 struct nfs4_lock_state *lsp; 7358 int status; 7359 7360 status = nfs4_set_lock_state(state, request); 7361 if (status != 0) 7362 return status; 7363 lsp = request->fl_u.nfs4_fl.owner; 7364 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) || 7365 test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) 7366 return 0; 7367 return nfs4_lock_expired(state, request); 7368 } 7369 #endif 7370 7371 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7372 { 7373 struct nfs_inode *nfsi = NFS_I(state->inode); 7374 struct nfs4_state_owner *sp = state->owner; 7375 unsigned char fl_flags = request->fl_flags; 7376 int status; 7377 7378 request->fl_flags |= FL_ACCESS; 7379 status = locks_lock_inode_wait(state->inode, request); 7380 if (status < 0) 7381 goto out; 7382 mutex_lock(&sp->so_delegreturn_mutex); 7383 down_read(&nfsi->rwsem); 7384 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { 7385 /* Yes: cache locks! */ 7386 /* ...but avoid races with delegation recall... */ 7387 request->fl_flags = fl_flags & ~FL_SLEEP; 7388 status = locks_lock_inode_wait(state->inode, request); 7389 up_read(&nfsi->rwsem); 7390 mutex_unlock(&sp->so_delegreturn_mutex); 7391 goto out; 7392 } 7393 up_read(&nfsi->rwsem); 7394 mutex_unlock(&sp->so_delegreturn_mutex); 7395 status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW); 7396 out: 7397 request->fl_flags = fl_flags; 7398 return status; 7399 } 7400 7401 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7402 { 7403 struct nfs4_exception exception = { 7404 .state = state, 7405 .inode = state->inode, 7406 .interruptible = true, 7407 }; 7408 int err; 7409 7410 do { 7411 err = _nfs4_proc_setlk(state, cmd, request); 7412 if (err == -NFS4ERR_DENIED) 7413 err = -EAGAIN; 7414 err = nfs4_handle_exception(NFS_SERVER(state->inode), 7415 err, &exception); 7416 } while (exception.retry); 7417 return err; 7418 } 7419 7420 #define NFS4_LOCK_MINTIMEOUT (1 * HZ) 7421 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) 7422 7423 static int 7424 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, 7425 struct file_lock *request) 7426 { 7427 int status = -ERESTARTSYS; 7428 unsigned long timeout = NFS4_LOCK_MINTIMEOUT; 7429 7430 while(!signalled()) { 7431 status = nfs4_proc_setlk(state, cmd, request); 7432 if ((status != -EAGAIN) || IS_SETLK(cmd)) 7433 break; 7434 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE); 7435 schedule_timeout(timeout); 7436 timeout *= 2; 7437 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout); 7438 status = -ERESTARTSYS; 7439 } 7440 return status; 7441 } 7442 7443 #ifdef CONFIG_NFS_V4_1 7444 struct nfs4_lock_waiter { 7445 struct inode *inode; 7446 struct nfs_lowner owner; 7447 wait_queue_entry_t wait; 7448 }; 7449 7450 static int 7451 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key) 7452 { 7453 struct nfs4_lock_waiter *waiter = 7454 container_of(wait, struct nfs4_lock_waiter, wait); 7455 7456 /* NULL key means to wake up everyone */ 7457 if (key) { 7458 struct cb_notify_lock_args *cbnl = key; 7459 struct nfs_lowner *lowner = &cbnl->cbnl_owner, 7460 *wowner = &waiter->owner; 7461 7462 /* Only wake if the callback was for the same owner. */ 7463 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev) 7464 return 0; 7465 7466 /* Make sure it's for the right inode */ 7467 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) 7468 return 0; 7469 } 7470 7471 return woken_wake_function(wait, mode, flags, key); 7472 } 7473 7474 static int 7475 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7476 { 7477 struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; 7478 struct nfs_server *server = NFS_SERVER(state->inode); 7479 struct nfs_client *clp = server->nfs_client; 7480 wait_queue_head_t *q = &clp->cl_lock_waitq; 7481 struct nfs4_lock_waiter waiter = { 7482 .inode = state->inode, 7483 .owner = { .clientid = clp->cl_clientid, 7484 .id = lsp->ls_seqid.owner_id, 7485 .s_dev = server->s_dev }, 7486 }; 7487 int status; 7488 7489 /* Don't bother with waitqueue if we don't expect a callback */ 7490 if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) 7491 return nfs4_retry_setlk_simple(state, cmd, request); 7492 7493 init_wait(&waiter.wait); 7494 waiter.wait.func = nfs4_wake_lock_waiter; 7495 add_wait_queue(q, &waiter.wait); 7496 7497 do { 7498 status = nfs4_proc_setlk(state, cmd, request); 7499 if (status != -EAGAIN || IS_SETLK(cmd)) 7500 break; 7501 7502 status = -ERESTARTSYS; 7503 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE, 7504 NFS4_LOCK_MAXTIMEOUT); 7505 } while (!signalled()); 7506 7507 remove_wait_queue(q, &waiter.wait); 7508 7509 return status; 7510 } 7511 #else /* !CONFIG_NFS_V4_1 */ 7512 static inline int 7513 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) 7514 { 7515 return nfs4_retry_setlk_simple(state, cmd, request); 7516 } 7517 #endif 7518 7519 static int 7520 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) 7521 { 7522 struct nfs_open_context *ctx; 7523 struct nfs4_state *state; 7524 int status; 7525 7526 /* verify open state */ 7527 ctx = nfs_file_open_context(filp); 7528 state = ctx->state; 7529 7530 if (IS_GETLK(cmd)) { 7531 if (state != NULL) 7532 return nfs4_proc_getlk(state, F_GETLK, request); 7533 return 0; 7534 } 7535 7536 if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) 7537 return -EINVAL; 7538 7539 if (request->fl_type == F_UNLCK) { 7540 if (state != NULL) 7541 return nfs4_proc_unlck(state, cmd, request); 7542 return 0; 7543 } 7544 7545 if (state == NULL) 7546 return -ENOLCK; 7547 7548 if ((request->fl_flags & FL_POSIX) && 7549 !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags)) 7550 return -ENOLCK; 7551 7552 /* 7553 * Don't rely on the VFS having checked the file open mode, 7554 * since it won't do this for flock() locks. 7555 */ 7556 switch (request->fl_type) { 7557 case F_RDLCK: 7558 if (!(filp->f_mode & FMODE_READ)) 7559 return -EBADF; 7560 break; 7561 case F_WRLCK: 7562 if (!(filp->f_mode & FMODE_WRITE)) 7563 return -EBADF; 7564 } 7565 7566 status = nfs4_set_lock_state(state, request); 7567 if (status != 0) 7568 return status; 7569 7570 return nfs4_retry_setlk(state, cmd, request); 7571 } 7572 7573 static int nfs4_delete_lease(struct file *file, void **priv) 7574 { 7575 return generic_setlease(file, F_UNLCK, NULL, priv); 7576 } 7577 7578 static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease, 7579 void **priv) 7580 { 7581 struct inode *inode = file_inode(file); 7582 fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE; 7583 int ret; 7584 7585 /* No delegation, no lease */ 7586 if (!nfs4_have_delegation(inode, type)) 7587 return -EAGAIN; 7588 ret = generic_setlease(file, arg, lease, priv); 7589 if (ret || nfs4_have_delegation(inode, type)) 7590 return ret; 7591 /* We raced with a delegation return */ 7592 nfs4_delete_lease(file, priv); 7593 return -EAGAIN; 7594 } 7595 7596 int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease, 7597 void **priv) 7598 { 7599 switch (arg) { 7600 case F_RDLCK: 7601 case F_WRLCK: 7602 return nfs4_add_lease(file, arg, lease, priv); 7603 case F_UNLCK: 7604 return nfs4_delete_lease(file, priv); 7605 default: 7606 return -EINVAL; 7607 } 7608 } 7609 7610 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid) 7611 { 7612 struct nfs_server *server = NFS_SERVER(state->inode); 7613 int err; 7614 7615 err = nfs4_set_lock_state(state, fl); 7616 if (err != 0) 7617 return err; 7618 do { 7619 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW); 7620 if (err != -NFS4ERR_DELAY) 7621 break; 7622 ssleep(1); 7623 } while (err == -NFS4ERR_DELAY); 7624 return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err); 7625 } 7626 7627 struct nfs_release_lockowner_data { 7628 struct nfs4_lock_state *lsp; 7629 struct nfs_server *server; 7630 struct nfs_release_lockowner_args args; 7631 struct nfs_release_lockowner_res res; 7632 unsigned long timestamp; 7633 }; 7634 7635 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata) 7636 { 7637 struct nfs_release_lockowner_data *data = calldata; 7638 struct nfs_server *server = data->server; 7639 nfs4_setup_sequence(server->nfs_client, &data->args.seq_args, 7640 &data->res.seq_res, task); 7641 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7642 data->timestamp = jiffies; 7643 } 7644 7645 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata) 7646 { 7647 struct nfs_release_lockowner_data *data = calldata; 7648 struct nfs_server *server = data->server; 7649 7650 nfs40_sequence_done(task, &data->res.seq_res); 7651 7652 switch (task->tk_status) { 7653 case 0: 7654 renew_lease(server, data->timestamp); 7655 break; 7656 case -NFS4ERR_STALE_CLIENTID: 7657 case -NFS4ERR_EXPIRED: 7658 nfs4_schedule_lease_recovery(server->nfs_client); 7659 break; 7660 case -NFS4ERR_LEASE_MOVED: 7661 case -NFS4ERR_DELAY: 7662 if (nfs4_async_handle_error(task, server, 7663 NULL, NULL) == -EAGAIN) 7664 rpc_restart_call_prepare(task); 7665 } 7666 } 7667 7668 static void nfs4_release_lockowner_release(void *calldata) 7669 { 7670 struct nfs_release_lockowner_data *data = calldata; 7671 nfs4_free_lock_state(data->server, data->lsp); 7672 kfree(calldata); 7673 } 7674 7675 static const struct rpc_call_ops nfs4_release_lockowner_ops = { 7676 .rpc_call_prepare = nfs4_release_lockowner_prepare, 7677 .rpc_call_done = nfs4_release_lockowner_done, 7678 .rpc_release = nfs4_release_lockowner_release, 7679 }; 7680 7681 static void 7682 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp) 7683 { 7684 struct nfs_release_lockowner_data *data; 7685 struct rpc_message msg = { 7686 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER], 7687 }; 7688 7689 if (server->nfs_client->cl_mvops->minor_version != 0) 7690 return; 7691 7692 data = kmalloc(sizeof(*data), GFP_KERNEL); 7693 if (!data) 7694 return; 7695 data->lsp = lsp; 7696 data->server = server; 7697 data->args.lock_owner.clientid = server->nfs_client->cl_clientid; 7698 data->args.lock_owner.id = lsp->ls_seqid.owner_id; 7699 data->args.lock_owner.s_dev = server->s_dev; 7700 7701 msg.rpc_argp = &data->args; 7702 msg.rpc_resp = &data->res; 7703 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0); 7704 rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data); 7705 } 7706 7707 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" 7708 7709 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler, 7710 struct mnt_idmap *idmap, 7711 struct dentry *unused, struct inode *inode, 7712 const char *key, const void *buf, 7713 size_t buflen, int flags) 7714 { 7715 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL); 7716 } 7717 7718 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler, 7719 struct dentry *unused, struct inode *inode, 7720 const char *key, void *buf, size_t buflen) 7721 { 7722 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL); 7723 } 7724 7725 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry) 7726 { 7727 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL); 7728 } 7729 7730 #if defined(CONFIG_NFS_V4_1) 7731 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl" 7732 7733 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler, 7734 struct mnt_idmap *idmap, 7735 struct dentry *unused, struct inode *inode, 7736 const char *key, const void *buf, 7737 size_t buflen, int flags) 7738 { 7739 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL); 7740 } 7741 7742 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler, 7743 struct dentry *unused, struct inode *inode, 7744 const char *key, void *buf, size_t buflen) 7745 { 7746 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL); 7747 } 7748 7749 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry) 7750 { 7751 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL); 7752 } 7753 7754 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl" 7755 7756 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler, 7757 struct mnt_idmap *idmap, 7758 struct dentry *unused, struct inode *inode, 7759 const char *key, const void *buf, 7760 size_t buflen, int flags) 7761 { 7762 return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL); 7763 } 7764 7765 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler, 7766 struct dentry *unused, struct inode *inode, 7767 const char *key, void *buf, size_t buflen) 7768 { 7769 return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL); 7770 } 7771 7772 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry) 7773 { 7774 return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL); 7775 } 7776 7777 #endif 7778 7779 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 7780 7781 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler, 7782 struct mnt_idmap *idmap, 7783 struct dentry *unused, struct inode *inode, 7784 const char *key, const void *buf, 7785 size_t buflen, int flags) 7786 { 7787 if (security_ismaclabel(key)) 7788 return nfs4_set_security_label(inode, buf, buflen); 7789 7790 return -EOPNOTSUPP; 7791 } 7792 7793 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler, 7794 struct dentry *unused, struct inode *inode, 7795 const char *key, void *buf, size_t buflen) 7796 { 7797 if (security_ismaclabel(key)) 7798 return nfs4_get_security_label(inode, buf, buflen); 7799 return -EOPNOTSUPP; 7800 } 7801 7802 static ssize_t 7803 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7804 { 7805 int len = 0; 7806 7807 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) { 7808 len = security_inode_listsecurity(inode, list, list_len); 7809 if (len >= 0 && list_len && len > list_len) 7810 return -ERANGE; 7811 } 7812 return len; 7813 } 7814 7815 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = { 7816 .prefix = XATTR_SECURITY_PREFIX, 7817 .get = nfs4_xattr_get_nfs4_label, 7818 .set = nfs4_xattr_set_nfs4_label, 7819 }; 7820 7821 #else 7822 7823 static ssize_t 7824 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len) 7825 { 7826 return 0; 7827 } 7828 7829 #endif 7830 7831 #ifdef CONFIG_NFS_V4_2 7832 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler, 7833 struct mnt_idmap *idmap, 7834 struct dentry *unused, struct inode *inode, 7835 const char *key, const void *buf, 7836 size_t buflen, int flags) 7837 { 7838 u32 mask; 7839 int ret; 7840 7841 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7842 return -EOPNOTSUPP; 7843 7844 /* 7845 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA* 7846 * flags right now. Handling of xattr operations use the normal 7847 * file read/write permissions. 7848 * 7849 * Just in case the server has other ideas (which RFC 8276 allows), 7850 * do a cached access check for the XA* flags to possibly avoid 7851 * doing an RPC and getting EACCES back. 7852 */ 7853 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7854 if (!(mask & NFS_ACCESS_XAWRITE)) 7855 return -EACCES; 7856 } 7857 7858 if (buf == NULL) { 7859 ret = nfs42_proc_removexattr(inode, key); 7860 if (!ret) 7861 nfs4_xattr_cache_remove(inode, key); 7862 } else { 7863 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags); 7864 if (!ret) 7865 nfs4_xattr_cache_add(inode, key, buf, NULL, buflen); 7866 } 7867 7868 return ret; 7869 } 7870 7871 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler, 7872 struct dentry *unused, struct inode *inode, 7873 const char *key, void *buf, size_t buflen) 7874 { 7875 u32 mask; 7876 ssize_t ret; 7877 7878 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7879 return -EOPNOTSUPP; 7880 7881 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7882 if (!(mask & NFS_ACCESS_XAREAD)) 7883 return -EACCES; 7884 } 7885 7886 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7887 if (ret) 7888 return ret; 7889 7890 ret = nfs4_xattr_cache_get(inode, key, buf, buflen); 7891 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7892 return ret; 7893 7894 ret = nfs42_proc_getxattr(inode, key, buf, buflen); 7895 7896 return ret; 7897 } 7898 7899 static ssize_t 7900 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7901 { 7902 u64 cookie; 7903 bool eof; 7904 ssize_t ret, size; 7905 char *buf; 7906 size_t buflen; 7907 u32 mask; 7908 7909 if (!nfs_server_capable(inode, NFS_CAP_XATTR)) 7910 return 0; 7911 7912 if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) { 7913 if (!(mask & NFS_ACCESS_XALIST)) 7914 return 0; 7915 } 7916 7917 ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE); 7918 if (ret) 7919 return ret; 7920 7921 ret = nfs4_xattr_cache_list(inode, list, list_len); 7922 if (ret >= 0 || (ret < 0 && ret != -ENOENT)) 7923 return ret; 7924 7925 cookie = 0; 7926 eof = false; 7927 buflen = list_len ? list_len : XATTR_LIST_MAX; 7928 buf = list_len ? list : NULL; 7929 size = 0; 7930 7931 while (!eof) { 7932 ret = nfs42_proc_listxattrs(inode, buf, buflen, 7933 &cookie, &eof); 7934 if (ret < 0) 7935 return ret; 7936 7937 if (list_len) { 7938 buf += ret; 7939 buflen -= ret; 7940 } 7941 size += ret; 7942 } 7943 7944 if (list_len) 7945 nfs4_xattr_cache_set_list(inode, list, size); 7946 7947 return size; 7948 } 7949 7950 #else 7951 7952 static ssize_t 7953 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len) 7954 { 7955 return 0; 7956 } 7957 #endif /* CONFIG_NFS_V4_2 */ 7958 7959 /* 7960 * nfs_fhget will use either the mounted_on_fileid or the fileid 7961 */ 7962 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr) 7963 { 7964 if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) || 7965 (fattr->valid & NFS_ATTR_FATTR_FILEID)) && 7966 (fattr->valid & NFS_ATTR_FATTR_FSID) && 7967 (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS))) 7968 return; 7969 7970 fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE | 7971 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL; 7972 fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO; 7973 fattr->nlink = 2; 7974 } 7975 7976 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 7977 const struct qstr *name, 7978 struct nfs4_fs_locations *fs_locations, 7979 struct page *page) 7980 { 7981 struct nfs_server *server = NFS_SERVER(dir); 7982 u32 bitmask[3]; 7983 struct nfs4_fs_locations_arg args = { 7984 .dir_fh = NFS_FH(dir), 7985 .name = name, 7986 .page = page, 7987 .bitmask = bitmask, 7988 }; 7989 struct nfs4_fs_locations_res res = { 7990 .fs_locations = fs_locations, 7991 }; 7992 struct rpc_message msg = { 7993 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 7994 .rpc_argp = &args, 7995 .rpc_resp = &res, 7996 }; 7997 int status; 7998 7999 dprintk("%s: start\n", __func__); 8000 8001 bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS; 8002 bitmask[1] = nfs4_fattr_bitmap[1]; 8003 8004 /* Ask for the fileid of the absent filesystem if mounted_on_fileid 8005 * is not supported */ 8006 if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID) 8007 bitmask[0] &= ~FATTR4_WORD0_FILEID; 8008 else 8009 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID; 8010 8011 nfs_fattr_init(fs_locations->fattr); 8012 fs_locations->server = server; 8013 fs_locations->nlocations = 0; 8014 status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0); 8015 dprintk("%s: returned status = %d\n", __func__, status); 8016 return status; 8017 } 8018 8019 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir, 8020 const struct qstr *name, 8021 struct nfs4_fs_locations *fs_locations, 8022 struct page *page) 8023 { 8024 struct nfs4_exception exception = { 8025 .interruptible = true, 8026 }; 8027 int err; 8028 do { 8029 err = _nfs4_proc_fs_locations(client, dir, name, 8030 fs_locations, page); 8031 trace_nfs4_get_fs_locations(dir, name, err); 8032 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8033 &exception); 8034 } while (exception.retry); 8035 return err; 8036 } 8037 8038 /* 8039 * This operation also signals the server that this client is 8040 * performing migration recovery. The server can stop returning 8041 * NFS4ERR_LEASE_MOVED to this client. A RENEW operation is 8042 * appended to this compound to identify the client ID which is 8043 * performing recovery. 8044 */ 8045 static int _nfs40_proc_get_locations(struct nfs_server *server, 8046 struct nfs_fh *fhandle, 8047 struct nfs4_fs_locations *locations, 8048 struct page *page, const struct cred *cred) 8049 { 8050 struct rpc_clnt *clnt = server->client; 8051 u32 bitmask[2] = { 8052 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8053 }; 8054 struct nfs4_fs_locations_arg args = { 8055 .clientid = server->nfs_client->cl_clientid, 8056 .fh = fhandle, 8057 .page = page, 8058 .bitmask = bitmask, 8059 .migration = 1, /* skip LOOKUP */ 8060 .renew = 1, /* append RENEW */ 8061 }; 8062 struct nfs4_fs_locations_res res = { 8063 .fs_locations = locations, 8064 .migration = 1, 8065 .renew = 1, 8066 }; 8067 struct rpc_message msg = { 8068 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8069 .rpc_argp = &args, 8070 .rpc_resp = &res, 8071 .rpc_cred = cred, 8072 }; 8073 unsigned long now = jiffies; 8074 int status; 8075 8076 nfs_fattr_init(locations->fattr); 8077 locations->server = server; 8078 locations->nlocations = 0; 8079 8080 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8081 status = nfs4_call_sync_sequence(clnt, server, &msg, 8082 &args.seq_args, &res.seq_res); 8083 if (status) 8084 return status; 8085 8086 renew_lease(server, now); 8087 return 0; 8088 } 8089 8090 #ifdef CONFIG_NFS_V4_1 8091 8092 /* 8093 * This operation also signals the server that this client is 8094 * performing migration recovery. The server can stop asserting 8095 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID 8096 * performing this operation is identified in the SEQUENCE 8097 * operation in this compound. 8098 * 8099 * When the client supports GETATTR(fs_locations_info), it can 8100 * be plumbed in here. 8101 */ 8102 static int _nfs41_proc_get_locations(struct nfs_server *server, 8103 struct nfs_fh *fhandle, 8104 struct nfs4_fs_locations *locations, 8105 struct page *page, const struct cred *cred) 8106 { 8107 struct rpc_clnt *clnt = server->client; 8108 u32 bitmask[2] = { 8109 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS, 8110 }; 8111 struct nfs4_fs_locations_arg args = { 8112 .fh = fhandle, 8113 .page = page, 8114 .bitmask = bitmask, 8115 .migration = 1, /* skip LOOKUP */ 8116 }; 8117 struct nfs4_fs_locations_res res = { 8118 .fs_locations = locations, 8119 .migration = 1, 8120 }; 8121 struct rpc_message msg = { 8122 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], 8123 .rpc_argp = &args, 8124 .rpc_resp = &res, 8125 .rpc_cred = cred, 8126 }; 8127 struct nfs4_call_sync_data data = { 8128 .seq_server = server, 8129 .seq_args = &args.seq_args, 8130 .seq_res = &res.seq_res, 8131 }; 8132 struct rpc_task_setup task_setup_data = { 8133 .rpc_client = clnt, 8134 .rpc_message = &msg, 8135 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 8136 .callback_data = &data, 8137 .flags = RPC_TASK_NO_ROUND_ROBIN, 8138 }; 8139 int status; 8140 8141 nfs_fattr_init(locations->fattr); 8142 locations->server = server; 8143 locations->nlocations = 0; 8144 8145 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8146 status = nfs4_call_sync_custom(&task_setup_data); 8147 if (status == NFS4_OK && 8148 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8149 status = -NFS4ERR_LEASE_MOVED; 8150 return status; 8151 } 8152 8153 #endif /* CONFIG_NFS_V4_1 */ 8154 8155 /** 8156 * nfs4_proc_get_locations - discover locations for a migrated FSID 8157 * @server: pointer to nfs_server to process 8158 * @fhandle: pointer to the kernel NFS client file handle 8159 * @locations: result of query 8160 * @page: buffer 8161 * @cred: credential to use for this operation 8162 * 8163 * Returns NFS4_OK on success, a negative NFS4ERR status code if the 8164 * operation failed, or a negative errno if a local error occurred. 8165 * 8166 * On success, "locations" is filled in, but if the server has 8167 * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not 8168 * asserted. 8169 * 8170 * -NFS4ERR_LEASE_MOVED is returned if the server still has leases 8171 * from this client that require migration recovery. 8172 */ 8173 int nfs4_proc_get_locations(struct nfs_server *server, 8174 struct nfs_fh *fhandle, 8175 struct nfs4_fs_locations *locations, 8176 struct page *page, const struct cred *cred) 8177 { 8178 struct nfs_client *clp = server->nfs_client; 8179 const struct nfs4_mig_recovery_ops *ops = 8180 clp->cl_mvops->mig_recovery_ops; 8181 struct nfs4_exception exception = { 8182 .interruptible = true, 8183 }; 8184 int status; 8185 8186 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8187 (unsigned long long)server->fsid.major, 8188 (unsigned long long)server->fsid.minor, 8189 clp->cl_hostname); 8190 nfs_display_fhandle(fhandle, __func__); 8191 8192 do { 8193 status = ops->get_locations(server, fhandle, locations, page, 8194 cred); 8195 if (status != -NFS4ERR_DELAY) 8196 break; 8197 nfs4_handle_exception(server, status, &exception); 8198 } while (exception.retry); 8199 return status; 8200 } 8201 8202 /* 8203 * This operation also signals the server that this client is 8204 * performing "lease moved" recovery. The server can stop 8205 * returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation 8206 * is appended to this compound to identify the client ID which is 8207 * performing recovery. 8208 */ 8209 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred) 8210 { 8211 struct nfs_server *server = NFS_SERVER(inode); 8212 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 8213 struct rpc_clnt *clnt = server->client; 8214 struct nfs4_fsid_present_arg args = { 8215 .fh = NFS_FH(inode), 8216 .clientid = clp->cl_clientid, 8217 .renew = 1, /* append RENEW */ 8218 }; 8219 struct nfs4_fsid_present_res res = { 8220 .renew = 1, 8221 }; 8222 struct rpc_message msg = { 8223 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8224 .rpc_argp = &args, 8225 .rpc_resp = &res, 8226 .rpc_cred = cred, 8227 }; 8228 unsigned long now = jiffies; 8229 int status; 8230 8231 res.fh = nfs_alloc_fhandle(); 8232 if (res.fh == NULL) 8233 return -ENOMEM; 8234 8235 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8236 status = nfs4_call_sync_sequence(clnt, server, &msg, 8237 &args.seq_args, &res.seq_res); 8238 nfs_free_fhandle(res.fh); 8239 if (status) 8240 return status; 8241 8242 do_renew_lease(clp, now); 8243 return 0; 8244 } 8245 8246 #ifdef CONFIG_NFS_V4_1 8247 8248 /* 8249 * This operation also signals the server that this client is 8250 * performing "lease moved" recovery. The server can stop asserting 8251 * SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing 8252 * this operation is identified in the SEQUENCE operation in this 8253 * compound. 8254 */ 8255 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred) 8256 { 8257 struct nfs_server *server = NFS_SERVER(inode); 8258 struct rpc_clnt *clnt = server->client; 8259 struct nfs4_fsid_present_arg args = { 8260 .fh = NFS_FH(inode), 8261 }; 8262 struct nfs4_fsid_present_res res = { 8263 }; 8264 struct rpc_message msg = { 8265 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT], 8266 .rpc_argp = &args, 8267 .rpc_resp = &res, 8268 .rpc_cred = cred, 8269 }; 8270 int status; 8271 8272 res.fh = nfs_alloc_fhandle(); 8273 if (res.fh == NULL) 8274 return -ENOMEM; 8275 8276 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 8277 status = nfs4_call_sync_sequence(clnt, server, &msg, 8278 &args.seq_args, &res.seq_res); 8279 nfs_free_fhandle(res.fh); 8280 if (status == NFS4_OK && 8281 res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED) 8282 status = -NFS4ERR_LEASE_MOVED; 8283 return status; 8284 } 8285 8286 #endif /* CONFIG_NFS_V4_1 */ 8287 8288 /** 8289 * nfs4_proc_fsid_present - Is this FSID present or absent on server? 8290 * @inode: inode on FSID to check 8291 * @cred: credential to use for this operation 8292 * 8293 * Server indicates whether the FSID is present, moved, or not 8294 * recognized. This operation is necessary to clear a LEASE_MOVED 8295 * condition for this client ID. 8296 * 8297 * Returns NFS4_OK if the FSID is present on this server, 8298 * -NFS4ERR_MOVED if the FSID is no longer present, a negative 8299 * NFS4ERR code if some error occurred on the server, or a 8300 * negative errno if a local failure occurred. 8301 */ 8302 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred) 8303 { 8304 struct nfs_server *server = NFS_SERVER(inode); 8305 struct nfs_client *clp = server->nfs_client; 8306 const struct nfs4_mig_recovery_ops *ops = 8307 clp->cl_mvops->mig_recovery_ops; 8308 struct nfs4_exception exception = { 8309 .interruptible = true, 8310 }; 8311 int status; 8312 8313 dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__, 8314 (unsigned long long)server->fsid.major, 8315 (unsigned long long)server->fsid.minor, 8316 clp->cl_hostname); 8317 nfs_display_fhandle(NFS_FH(inode), __func__); 8318 8319 do { 8320 status = ops->fsid_present(inode, cred); 8321 if (status != -NFS4ERR_DELAY) 8322 break; 8323 nfs4_handle_exception(server, status, &exception); 8324 } while (exception.retry); 8325 return status; 8326 } 8327 8328 /* 8329 * If 'use_integrity' is true and the state managment nfs_client 8330 * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient 8331 * and the machine credential as per RFC3530bis and RFC5661 Security 8332 * Considerations sections. Otherwise, just use the user cred with the 8333 * filesystem's rpc_client. 8334 */ 8335 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity) 8336 { 8337 int status; 8338 struct rpc_clnt *clnt = NFS_SERVER(dir)->client; 8339 struct nfs_client *clp = NFS_SERVER(dir)->nfs_client; 8340 struct nfs4_secinfo_arg args = { 8341 .dir_fh = NFS_FH(dir), 8342 .name = name, 8343 }; 8344 struct nfs4_secinfo_res res = { 8345 .flavors = flavors, 8346 }; 8347 struct rpc_message msg = { 8348 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO], 8349 .rpc_argp = &args, 8350 .rpc_resp = &res, 8351 }; 8352 struct nfs4_call_sync_data data = { 8353 .seq_server = NFS_SERVER(dir), 8354 .seq_args = &args.seq_args, 8355 .seq_res = &res.seq_res, 8356 }; 8357 struct rpc_task_setup task_setup = { 8358 .rpc_client = clnt, 8359 .rpc_message = &msg, 8360 .callback_ops = clp->cl_mvops->call_sync_ops, 8361 .callback_data = &data, 8362 .flags = RPC_TASK_NO_ROUND_ROBIN, 8363 }; 8364 const struct cred *cred = NULL; 8365 8366 if (use_integrity) { 8367 clnt = clp->cl_rpcclient; 8368 task_setup.rpc_client = clnt; 8369 8370 cred = nfs4_get_clid_cred(clp); 8371 msg.rpc_cred = cred; 8372 } 8373 8374 dprintk("NFS call secinfo %s\n", name->name); 8375 8376 nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg); 8377 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 8378 status = nfs4_call_sync_custom(&task_setup); 8379 8380 dprintk("NFS reply secinfo: %d\n", status); 8381 8382 put_cred(cred); 8383 return status; 8384 } 8385 8386 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, 8387 struct nfs4_secinfo_flavors *flavors) 8388 { 8389 struct nfs4_exception exception = { 8390 .interruptible = true, 8391 }; 8392 int err; 8393 do { 8394 err = -NFS4ERR_WRONGSEC; 8395 8396 /* try to use integrity protection with machine cred */ 8397 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client)) 8398 err = _nfs4_proc_secinfo(dir, name, flavors, true); 8399 8400 /* 8401 * if unable to use integrity protection, or SECINFO with 8402 * integrity protection returns NFS4ERR_WRONGSEC (which is 8403 * disallowed by spec, but exists in deployed servers) use 8404 * the current filesystem's rpc_client and the user cred. 8405 */ 8406 if (err == -NFS4ERR_WRONGSEC) 8407 err = _nfs4_proc_secinfo(dir, name, flavors, false); 8408 8409 trace_nfs4_secinfo(dir, name, err); 8410 err = nfs4_handle_exception(NFS_SERVER(dir), err, 8411 &exception); 8412 } while (exception.retry); 8413 return err; 8414 } 8415 8416 #ifdef CONFIG_NFS_V4_1 8417 /* 8418 * Check the exchange flags returned by the server for invalid flags, having 8419 * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or 8420 * DS flags set. 8421 */ 8422 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version) 8423 { 8424 if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R)) 8425 goto out_inval; 8426 else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R)) 8427 goto out_inval; 8428 if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) && 8429 (flags & EXCHGID4_FLAG_USE_NON_PNFS)) 8430 goto out_inval; 8431 if (!(flags & (EXCHGID4_FLAG_MASK_PNFS))) 8432 goto out_inval; 8433 return NFS_OK; 8434 out_inval: 8435 return -NFS4ERR_INVAL; 8436 } 8437 8438 static bool 8439 nfs41_same_server_scope(struct nfs41_server_scope *a, 8440 struct nfs41_server_scope *b) 8441 { 8442 if (a->server_scope_sz != b->server_scope_sz) 8443 return false; 8444 return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0; 8445 } 8446 8447 static void 8448 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata) 8449 { 8450 struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp; 8451 struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp; 8452 struct nfs_client *clp = args->client; 8453 8454 switch (task->tk_status) { 8455 case -NFS4ERR_BADSESSION: 8456 case -NFS4ERR_DEADSESSION: 8457 nfs4_schedule_session_recovery(clp->cl_session, 8458 task->tk_status); 8459 return; 8460 } 8461 if (args->dir == NFS4_CDFC4_FORE_OR_BOTH && 8462 res->dir != NFS4_CDFS4_BOTH) { 8463 rpc_task_close_connection(task); 8464 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES) 8465 rpc_restart_call(task); 8466 } 8467 } 8468 8469 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = { 8470 .rpc_call_done = nfs4_bind_one_conn_to_session_done, 8471 }; 8472 8473 /* 8474 * nfs4_proc_bind_one_conn_to_session() 8475 * 8476 * The 4.1 client currently uses the same TCP connection for the 8477 * fore and backchannel. 8478 */ 8479 static 8480 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt, 8481 struct rpc_xprt *xprt, 8482 struct nfs_client *clp, 8483 const struct cred *cred) 8484 { 8485 int status; 8486 struct nfs41_bind_conn_to_session_args args = { 8487 .client = clp, 8488 .dir = NFS4_CDFC4_FORE_OR_BOTH, 8489 .retries = 0, 8490 }; 8491 struct nfs41_bind_conn_to_session_res res; 8492 struct rpc_message msg = { 8493 .rpc_proc = 8494 &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION], 8495 .rpc_argp = &args, 8496 .rpc_resp = &res, 8497 .rpc_cred = cred, 8498 }; 8499 struct rpc_task_setup task_setup_data = { 8500 .rpc_client = clnt, 8501 .rpc_xprt = xprt, 8502 .callback_ops = &nfs4_bind_one_conn_to_session_ops, 8503 .rpc_message = &msg, 8504 .flags = RPC_TASK_TIMEOUT, 8505 }; 8506 struct rpc_task *task; 8507 8508 nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id); 8509 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN)) 8510 args.dir = NFS4_CDFC4_FORE; 8511 8512 /* Do not set the backchannel flag unless this is clnt->cl_xprt */ 8513 if (xprt != rcu_access_pointer(clnt->cl_xprt)) 8514 args.dir = NFS4_CDFC4_FORE; 8515 8516 task = rpc_run_task(&task_setup_data); 8517 if (!IS_ERR(task)) { 8518 status = task->tk_status; 8519 rpc_put_task(task); 8520 } else 8521 status = PTR_ERR(task); 8522 trace_nfs4_bind_conn_to_session(clp, status); 8523 if (status == 0) { 8524 if (memcmp(res.sessionid.data, 8525 clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) { 8526 dprintk("NFS: %s: Session ID mismatch\n", __func__); 8527 return -EIO; 8528 } 8529 if ((res.dir & args.dir) != res.dir || res.dir == 0) { 8530 dprintk("NFS: %s: Unexpected direction from server\n", 8531 __func__); 8532 return -EIO; 8533 } 8534 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) { 8535 dprintk("NFS: %s: Server returned RDMA mode = true\n", 8536 __func__); 8537 return -EIO; 8538 } 8539 } 8540 8541 return status; 8542 } 8543 8544 struct rpc_bind_conn_calldata { 8545 struct nfs_client *clp; 8546 const struct cred *cred; 8547 }; 8548 8549 static int 8550 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt, 8551 struct rpc_xprt *xprt, 8552 void *calldata) 8553 { 8554 struct rpc_bind_conn_calldata *p = calldata; 8555 8556 return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred); 8557 } 8558 8559 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred) 8560 { 8561 struct rpc_bind_conn_calldata data = { 8562 .clp = clp, 8563 .cred = cred, 8564 }; 8565 return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient, 8566 nfs4_proc_bind_conn_to_session_callback, &data); 8567 } 8568 8569 /* 8570 * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map 8571 * and operations we'd like to see to enable certain features in the allow map 8572 */ 8573 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = { 8574 .how = SP4_MACH_CRED, 8575 .enforce.u.words = { 8576 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8577 1 << (OP_EXCHANGE_ID - 32) | 8578 1 << (OP_CREATE_SESSION - 32) | 8579 1 << (OP_DESTROY_SESSION - 32) | 8580 1 << (OP_DESTROY_CLIENTID - 32) 8581 }, 8582 .allow.u.words = { 8583 [0] = 1 << (OP_CLOSE) | 8584 1 << (OP_OPEN_DOWNGRADE) | 8585 1 << (OP_LOCKU) | 8586 1 << (OP_DELEGRETURN) | 8587 1 << (OP_COMMIT), 8588 [1] = 1 << (OP_SECINFO - 32) | 8589 1 << (OP_SECINFO_NO_NAME - 32) | 8590 1 << (OP_LAYOUTRETURN - 32) | 8591 1 << (OP_TEST_STATEID - 32) | 8592 1 << (OP_FREE_STATEID - 32) | 8593 1 << (OP_WRITE - 32) 8594 } 8595 }; 8596 8597 /* 8598 * Select the state protection mode for client `clp' given the server results 8599 * from exchange_id in `sp'. 8600 * 8601 * Returns 0 on success, negative errno otherwise. 8602 */ 8603 static int nfs4_sp4_select_mode(struct nfs_client *clp, 8604 struct nfs41_state_protection *sp) 8605 { 8606 static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = { 8607 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) | 8608 1 << (OP_EXCHANGE_ID - 32) | 8609 1 << (OP_CREATE_SESSION - 32) | 8610 1 << (OP_DESTROY_SESSION - 32) | 8611 1 << (OP_DESTROY_CLIENTID - 32) 8612 }; 8613 unsigned long flags = 0; 8614 unsigned int i; 8615 int ret = 0; 8616 8617 if (sp->how == SP4_MACH_CRED) { 8618 /* Print state protect result */ 8619 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n"); 8620 for (i = 0; i <= LAST_NFS4_OP; i++) { 8621 if (test_bit(i, sp->enforce.u.longs)) 8622 dfprintk(MOUNT, " enforce op %d\n", i); 8623 if (test_bit(i, sp->allow.u.longs)) 8624 dfprintk(MOUNT, " allow op %d\n", i); 8625 } 8626 8627 /* make sure nothing is on enforce list that isn't supported */ 8628 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) { 8629 if (sp->enforce.u.words[i] & ~supported_enforce[i]) { 8630 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8631 ret = -EINVAL; 8632 goto out; 8633 } 8634 } 8635 8636 /* 8637 * Minimal mode - state operations are allowed to use machine 8638 * credential. Note this already happens by default, so the 8639 * client doesn't have to do anything more than the negotiation. 8640 * 8641 * NOTE: we don't care if EXCHANGE_ID is in the list - 8642 * we're already using the machine cred for exchange_id 8643 * and will never use a different cred. 8644 */ 8645 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) && 8646 test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) && 8647 test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) && 8648 test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) { 8649 dfprintk(MOUNT, "sp4_mach_cred:\n"); 8650 dfprintk(MOUNT, " minimal mode enabled\n"); 8651 __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags); 8652 } else { 8653 dfprintk(MOUNT, "sp4_mach_cred: disabled\n"); 8654 ret = -EINVAL; 8655 goto out; 8656 } 8657 8658 if (test_bit(OP_CLOSE, sp->allow.u.longs) && 8659 test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) && 8660 test_bit(OP_DELEGRETURN, sp->allow.u.longs) && 8661 test_bit(OP_LOCKU, sp->allow.u.longs)) { 8662 dfprintk(MOUNT, " cleanup mode enabled\n"); 8663 __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags); 8664 } 8665 8666 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) { 8667 dfprintk(MOUNT, " pnfs cleanup mode enabled\n"); 8668 __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags); 8669 } 8670 8671 if (test_bit(OP_SECINFO, sp->allow.u.longs) && 8672 test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) { 8673 dfprintk(MOUNT, " secinfo mode enabled\n"); 8674 __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags); 8675 } 8676 8677 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) && 8678 test_bit(OP_FREE_STATEID, sp->allow.u.longs)) { 8679 dfprintk(MOUNT, " stateid mode enabled\n"); 8680 __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags); 8681 } 8682 8683 if (test_bit(OP_WRITE, sp->allow.u.longs)) { 8684 dfprintk(MOUNT, " write mode enabled\n"); 8685 __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags); 8686 } 8687 8688 if (test_bit(OP_COMMIT, sp->allow.u.longs)) { 8689 dfprintk(MOUNT, " commit mode enabled\n"); 8690 __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags); 8691 } 8692 } 8693 out: 8694 clp->cl_sp4_flags = flags; 8695 return ret; 8696 } 8697 8698 struct nfs41_exchange_id_data { 8699 struct nfs41_exchange_id_res res; 8700 struct nfs41_exchange_id_args args; 8701 }; 8702 8703 static void nfs4_exchange_id_release(void *data) 8704 { 8705 struct nfs41_exchange_id_data *cdata = 8706 (struct nfs41_exchange_id_data *)data; 8707 8708 nfs_put_client(cdata->args.client); 8709 kfree(cdata->res.impl_id); 8710 kfree(cdata->res.server_scope); 8711 kfree(cdata->res.server_owner); 8712 kfree(cdata); 8713 } 8714 8715 static const struct rpc_call_ops nfs4_exchange_id_call_ops = { 8716 .rpc_release = nfs4_exchange_id_release, 8717 }; 8718 8719 /* 8720 * _nfs4_proc_exchange_id() 8721 * 8722 * Wrapper for EXCHANGE_ID operation. 8723 */ 8724 static struct rpc_task * 8725 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred, 8726 u32 sp4_how, struct rpc_xprt *xprt) 8727 { 8728 struct rpc_message msg = { 8729 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID], 8730 .rpc_cred = cred, 8731 }; 8732 struct rpc_task_setup task_setup_data = { 8733 .rpc_client = clp->cl_rpcclient, 8734 .callback_ops = &nfs4_exchange_id_call_ops, 8735 .rpc_message = &msg, 8736 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN, 8737 }; 8738 struct nfs41_exchange_id_data *calldata; 8739 int status; 8740 8741 if (!refcount_inc_not_zero(&clp->cl_count)) 8742 return ERR_PTR(-EIO); 8743 8744 status = -ENOMEM; 8745 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 8746 if (!calldata) 8747 goto out; 8748 8749 nfs4_init_boot_verifier(clp, &calldata->args.verifier); 8750 8751 status = nfs4_init_uniform_client_string(clp); 8752 if (status) 8753 goto out_calldata; 8754 8755 calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner), 8756 GFP_NOFS); 8757 status = -ENOMEM; 8758 if (unlikely(calldata->res.server_owner == NULL)) 8759 goto out_calldata; 8760 8761 calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope), 8762 GFP_NOFS); 8763 if (unlikely(calldata->res.server_scope == NULL)) 8764 goto out_server_owner; 8765 8766 calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS); 8767 if (unlikely(calldata->res.impl_id == NULL)) 8768 goto out_server_scope; 8769 8770 switch (sp4_how) { 8771 case SP4_NONE: 8772 calldata->args.state_protect.how = SP4_NONE; 8773 break; 8774 8775 case SP4_MACH_CRED: 8776 calldata->args.state_protect = nfs4_sp4_mach_cred_request; 8777 break; 8778 8779 default: 8780 /* unsupported! */ 8781 WARN_ON_ONCE(1); 8782 status = -EINVAL; 8783 goto out_impl_id; 8784 } 8785 if (xprt) { 8786 task_setup_data.rpc_xprt = xprt; 8787 task_setup_data.flags |= RPC_TASK_SOFTCONN; 8788 memcpy(calldata->args.verifier.data, clp->cl_confirm.data, 8789 sizeof(calldata->args.verifier.data)); 8790 } 8791 calldata->args.client = clp; 8792 calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER | 8793 EXCHGID4_FLAG_BIND_PRINC_STATEID; 8794 #ifdef CONFIG_NFS_V4_1_MIGRATION 8795 calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR; 8796 #endif 8797 if (test_bit(NFS_CS_DS, &clp->cl_flags)) 8798 calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS; 8799 msg.rpc_argp = &calldata->args; 8800 msg.rpc_resp = &calldata->res; 8801 task_setup_data.callback_data = calldata; 8802 8803 return rpc_run_task(&task_setup_data); 8804 8805 out_impl_id: 8806 kfree(calldata->res.impl_id); 8807 out_server_scope: 8808 kfree(calldata->res.server_scope); 8809 out_server_owner: 8810 kfree(calldata->res.server_owner); 8811 out_calldata: 8812 kfree(calldata); 8813 out: 8814 nfs_put_client(clp); 8815 return ERR_PTR(status); 8816 } 8817 8818 /* 8819 * _nfs4_proc_exchange_id() 8820 * 8821 * Wrapper for EXCHANGE_ID operation. 8822 */ 8823 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred, 8824 u32 sp4_how) 8825 { 8826 struct rpc_task *task; 8827 struct nfs41_exchange_id_args *argp; 8828 struct nfs41_exchange_id_res *resp; 8829 unsigned long now = jiffies; 8830 int status; 8831 8832 task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL); 8833 if (IS_ERR(task)) 8834 return PTR_ERR(task); 8835 8836 argp = task->tk_msg.rpc_argp; 8837 resp = task->tk_msg.rpc_resp; 8838 status = task->tk_status; 8839 if (status != 0) 8840 goto out; 8841 8842 status = nfs4_check_cl_exchange_flags(resp->flags, 8843 clp->cl_mvops->minor_version); 8844 if (status != 0) 8845 goto out; 8846 8847 status = nfs4_sp4_select_mode(clp, &resp->state_protect); 8848 if (status != 0) 8849 goto out; 8850 8851 do_renew_lease(clp, now); 8852 8853 clp->cl_clientid = resp->clientid; 8854 clp->cl_exchange_flags = resp->flags; 8855 clp->cl_seqid = resp->seqid; 8856 /* Client ID is not confirmed */ 8857 if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R)) 8858 clear_bit(NFS4_SESSION_ESTABLISHED, 8859 &clp->cl_session->session_state); 8860 8861 if (clp->cl_serverscope != NULL && 8862 !nfs41_same_server_scope(clp->cl_serverscope, 8863 resp->server_scope)) { 8864 dprintk("%s: server_scope mismatch detected\n", 8865 __func__); 8866 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state); 8867 } 8868 8869 swap(clp->cl_serverowner, resp->server_owner); 8870 swap(clp->cl_serverscope, resp->server_scope); 8871 swap(clp->cl_implid, resp->impl_id); 8872 8873 /* Save the EXCHANGE_ID verifier session trunk tests */ 8874 memcpy(clp->cl_confirm.data, argp->verifier.data, 8875 sizeof(clp->cl_confirm.data)); 8876 out: 8877 trace_nfs4_exchange_id(clp, status); 8878 rpc_put_task(task); 8879 return status; 8880 } 8881 8882 /* 8883 * nfs4_proc_exchange_id() 8884 * 8885 * Returns zero, a negative errno, or a negative NFS4ERR status code. 8886 * 8887 * Since the clientid has expired, all compounds using sessions 8888 * associated with the stale clientid will be returning 8889 * NFS4ERR_BADSESSION in the sequence operation, and will therefore 8890 * be in some phase of session reset. 8891 * 8892 * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used. 8893 */ 8894 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred) 8895 { 8896 rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor; 8897 int status; 8898 8899 /* try SP4_MACH_CRED if krb5i/p */ 8900 if (authflavor == RPC_AUTH_GSS_KRB5I || 8901 authflavor == RPC_AUTH_GSS_KRB5P) { 8902 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED); 8903 if (!status) 8904 return 0; 8905 } 8906 8907 /* try SP4_NONE */ 8908 return _nfs4_proc_exchange_id(clp, cred, SP4_NONE); 8909 } 8910 8911 /** 8912 * nfs4_test_session_trunk 8913 * 8914 * This is an add_xprt_test() test function called from 8915 * rpc_clnt_setup_test_and_add_xprt. 8916 * 8917 * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt 8918 * and is dereferrenced in nfs4_exchange_id_release 8919 * 8920 * Upon success, add the new transport to the rpc_clnt 8921 * 8922 * @clnt: struct rpc_clnt to get new transport 8923 * @xprt: the rpc_xprt to test 8924 * @data: call data for _nfs4_proc_exchange_id. 8925 */ 8926 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, 8927 void *data) 8928 { 8929 struct nfs4_add_xprt_data *adata = data; 8930 struct rpc_task *task; 8931 int status; 8932 8933 u32 sp4_how; 8934 8935 dprintk("--> %s try %s\n", __func__, 8936 xprt->address_strings[RPC_DISPLAY_ADDR]); 8937 8938 sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); 8939 8940 try_again: 8941 /* Test connection for session trunking. Async exchange_id call */ 8942 task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt); 8943 if (IS_ERR(task)) 8944 return; 8945 8946 status = task->tk_status; 8947 if (status == 0) 8948 status = nfs4_detect_session_trunking(adata->clp, 8949 task->tk_msg.rpc_resp, xprt); 8950 8951 if (status == 0) 8952 rpc_clnt_xprt_switch_add_xprt(clnt, xprt); 8953 else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt, 8954 (struct sockaddr *)&xprt->addr)) 8955 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt); 8956 8957 rpc_put_task(task); 8958 if (status == -NFS4ERR_DELAY) { 8959 ssleep(1); 8960 goto try_again; 8961 } 8962 } 8963 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); 8964 8965 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, 8966 const struct cred *cred) 8967 { 8968 struct rpc_message msg = { 8969 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID], 8970 .rpc_argp = clp, 8971 .rpc_cred = cred, 8972 }; 8973 int status; 8974 8975 status = rpc_call_sync(clp->cl_rpcclient, &msg, 8976 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 8977 trace_nfs4_destroy_clientid(clp, status); 8978 if (status) 8979 dprintk("NFS: Got error %d from the server %s on " 8980 "DESTROY_CLIENTID.", status, clp->cl_hostname); 8981 return status; 8982 } 8983 8984 static int nfs4_proc_destroy_clientid(struct nfs_client *clp, 8985 const struct cred *cred) 8986 { 8987 unsigned int loop; 8988 int ret; 8989 8990 for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { 8991 ret = _nfs4_proc_destroy_clientid(clp, cred); 8992 switch (ret) { 8993 case -NFS4ERR_DELAY: 8994 case -NFS4ERR_CLIENTID_BUSY: 8995 ssleep(1); 8996 break; 8997 default: 8998 return ret; 8999 } 9000 } 9001 return 0; 9002 } 9003 9004 int nfs4_destroy_clientid(struct nfs_client *clp) 9005 { 9006 const struct cred *cred; 9007 int ret = 0; 9008 9009 if (clp->cl_mvops->minor_version < 1) 9010 goto out; 9011 if (clp->cl_exchange_flags == 0) 9012 goto out; 9013 if (clp->cl_preserve_clid) 9014 goto out; 9015 cred = nfs4_get_clid_cred(clp); 9016 ret = nfs4_proc_destroy_clientid(clp, cred); 9017 put_cred(cred); 9018 switch (ret) { 9019 case 0: 9020 case -NFS4ERR_STALE_CLIENTID: 9021 clp->cl_exchange_flags = 0; 9022 } 9023 out: 9024 return ret; 9025 } 9026 9027 #endif /* CONFIG_NFS_V4_1 */ 9028 9029 struct nfs4_get_lease_time_data { 9030 struct nfs4_get_lease_time_args *args; 9031 struct nfs4_get_lease_time_res *res; 9032 struct nfs_client *clp; 9033 }; 9034 9035 static void nfs4_get_lease_time_prepare(struct rpc_task *task, 9036 void *calldata) 9037 { 9038 struct nfs4_get_lease_time_data *data = 9039 (struct nfs4_get_lease_time_data *)calldata; 9040 9041 /* just setup sequence, do not trigger session recovery 9042 since we're invoked within one */ 9043 nfs4_setup_sequence(data->clp, 9044 &data->args->la_seq_args, 9045 &data->res->lr_seq_res, 9046 task); 9047 } 9048 9049 /* 9050 * Called from nfs4_state_manager thread for session setup, so don't recover 9051 * from sequence operation or clientid errors. 9052 */ 9053 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata) 9054 { 9055 struct nfs4_get_lease_time_data *data = 9056 (struct nfs4_get_lease_time_data *)calldata; 9057 9058 if (!nfs4_sequence_done(task, &data->res->lr_seq_res)) 9059 return; 9060 switch (task->tk_status) { 9061 case -NFS4ERR_DELAY: 9062 case -NFS4ERR_GRACE: 9063 rpc_delay(task, NFS4_POLL_RETRY_MIN); 9064 task->tk_status = 0; 9065 fallthrough; 9066 case -NFS4ERR_RETRY_UNCACHED_REP: 9067 rpc_restart_call_prepare(task); 9068 return; 9069 } 9070 } 9071 9072 static const struct rpc_call_ops nfs4_get_lease_time_ops = { 9073 .rpc_call_prepare = nfs4_get_lease_time_prepare, 9074 .rpc_call_done = nfs4_get_lease_time_done, 9075 }; 9076 9077 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo) 9078 { 9079 struct nfs4_get_lease_time_args args; 9080 struct nfs4_get_lease_time_res res = { 9081 .lr_fsinfo = fsinfo, 9082 }; 9083 struct nfs4_get_lease_time_data data = { 9084 .args = &args, 9085 .res = &res, 9086 .clp = clp, 9087 }; 9088 struct rpc_message msg = { 9089 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME], 9090 .rpc_argp = &args, 9091 .rpc_resp = &res, 9092 }; 9093 struct rpc_task_setup task_setup = { 9094 .rpc_client = clp->cl_rpcclient, 9095 .rpc_message = &msg, 9096 .callback_ops = &nfs4_get_lease_time_ops, 9097 .callback_data = &data, 9098 .flags = RPC_TASK_TIMEOUT, 9099 }; 9100 9101 nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1); 9102 return nfs4_call_sync_custom(&task_setup); 9103 } 9104 9105 #ifdef CONFIG_NFS_V4_1 9106 9107 /* 9108 * Initialize the values to be used by the client in CREATE_SESSION 9109 * If nfs4_init_session set the fore channel request and response sizes, 9110 * use them. 9111 * 9112 * Set the back channel max_resp_sz_cached to zero to force the client to 9113 * always set csa_cachethis to FALSE because the current implementation 9114 * of the back channel DRC only supports caching the CB_SEQUENCE operation. 9115 */ 9116 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args, 9117 struct rpc_clnt *clnt) 9118 { 9119 unsigned int max_rqst_sz, max_resp_sz; 9120 unsigned int max_bc_payload = rpc_max_bc_payload(clnt); 9121 unsigned int max_bc_slots = rpc_num_bc_slots(clnt); 9122 9123 max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead; 9124 max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead; 9125 9126 /* Fore channel attributes */ 9127 args->fc_attrs.max_rqst_sz = max_rqst_sz; 9128 args->fc_attrs.max_resp_sz = max_resp_sz; 9129 args->fc_attrs.max_ops = NFS4_MAX_OPS; 9130 args->fc_attrs.max_reqs = max_session_slots; 9131 9132 dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u " 9133 "max_ops=%u max_reqs=%u\n", 9134 __func__, 9135 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz, 9136 args->fc_attrs.max_ops, args->fc_attrs.max_reqs); 9137 9138 /* Back channel attributes */ 9139 args->bc_attrs.max_rqst_sz = max_bc_payload; 9140 args->bc_attrs.max_resp_sz = max_bc_payload; 9141 args->bc_attrs.max_resp_sz_cached = 0; 9142 args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS; 9143 args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1); 9144 if (args->bc_attrs.max_reqs > max_bc_slots) 9145 args->bc_attrs.max_reqs = max_bc_slots; 9146 9147 dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u " 9148 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n", 9149 __func__, 9150 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz, 9151 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops, 9152 args->bc_attrs.max_reqs); 9153 } 9154 9155 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, 9156 struct nfs41_create_session_res *res) 9157 { 9158 struct nfs4_channel_attrs *sent = &args->fc_attrs; 9159 struct nfs4_channel_attrs *rcvd = &res->fc_attrs; 9160 9161 if (rcvd->max_resp_sz > sent->max_resp_sz) 9162 return -EINVAL; 9163 /* 9164 * Our requested max_ops is the minimum we need; we're not 9165 * prepared to break up compounds into smaller pieces than that. 9166 * So, no point even trying to continue if the server won't 9167 * cooperate: 9168 */ 9169 if (rcvd->max_ops < sent->max_ops) 9170 return -EINVAL; 9171 if (rcvd->max_reqs == 0) 9172 return -EINVAL; 9173 if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE) 9174 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE; 9175 return 0; 9176 } 9177 9178 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, 9179 struct nfs41_create_session_res *res) 9180 { 9181 struct nfs4_channel_attrs *sent = &args->bc_attrs; 9182 struct nfs4_channel_attrs *rcvd = &res->bc_attrs; 9183 9184 if (!(res->flags & SESSION4_BACK_CHAN)) 9185 goto out; 9186 if (rcvd->max_rqst_sz > sent->max_rqst_sz) 9187 return -EINVAL; 9188 if (rcvd->max_resp_sz < sent->max_resp_sz) 9189 return -EINVAL; 9190 if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached) 9191 return -EINVAL; 9192 if (rcvd->max_ops > sent->max_ops) 9193 return -EINVAL; 9194 if (rcvd->max_reqs > sent->max_reqs) 9195 return -EINVAL; 9196 out: 9197 return 0; 9198 } 9199 9200 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args, 9201 struct nfs41_create_session_res *res) 9202 { 9203 int ret; 9204 9205 ret = nfs4_verify_fore_channel_attrs(args, res); 9206 if (ret) 9207 return ret; 9208 return nfs4_verify_back_channel_attrs(args, res); 9209 } 9210 9211 static void nfs4_update_session(struct nfs4_session *session, 9212 struct nfs41_create_session_res *res) 9213 { 9214 nfs4_copy_sessionid(&session->sess_id, &res->sessionid); 9215 /* Mark client id and session as being confirmed */ 9216 session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R; 9217 set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state); 9218 session->flags = res->flags; 9219 memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs)); 9220 if (res->flags & SESSION4_BACK_CHAN) 9221 memcpy(&session->bc_attrs, &res->bc_attrs, 9222 sizeof(session->bc_attrs)); 9223 } 9224 9225 static int _nfs4_proc_create_session(struct nfs_client *clp, 9226 const struct cred *cred) 9227 { 9228 struct nfs4_session *session = clp->cl_session; 9229 struct nfs41_create_session_args args = { 9230 .client = clp, 9231 .clientid = clp->cl_clientid, 9232 .seqid = clp->cl_seqid, 9233 .cb_program = NFS4_CALLBACK, 9234 }; 9235 struct nfs41_create_session_res res; 9236 9237 struct rpc_message msg = { 9238 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION], 9239 .rpc_argp = &args, 9240 .rpc_resp = &res, 9241 .rpc_cred = cred, 9242 }; 9243 int status; 9244 9245 nfs4_init_channel_attrs(&args, clp->cl_rpcclient); 9246 args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN); 9247 9248 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9249 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9250 trace_nfs4_create_session(clp, status); 9251 9252 switch (status) { 9253 case -NFS4ERR_STALE_CLIENTID: 9254 case -NFS4ERR_DELAY: 9255 case -ETIMEDOUT: 9256 case -EACCES: 9257 case -EAGAIN: 9258 goto out; 9259 } 9260 9261 clp->cl_seqid++; 9262 if (!status) { 9263 /* Verify the session's negotiated channel_attrs values */ 9264 status = nfs4_verify_channel_attrs(&args, &res); 9265 /* Increment the clientid slot sequence id */ 9266 if (status) 9267 goto out; 9268 nfs4_update_session(session, &res); 9269 } 9270 out: 9271 return status; 9272 } 9273 9274 /* 9275 * Issues a CREATE_SESSION operation to the server. 9276 * It is the responsibility of the caller to verify the session is 9277 * expired before calling this routine. 9278 */ 9279 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred) 9280 { 9281 int status; 9282 unsigned *ptr; 9283 struct nfs4_session *session = clp->cl_session; 9284 struct nfs4_add_xprt_data xprtdata = { 9285 .clp = clp, 9286 }; 9287 struct rpc_add_xprt_test rpcdata = { 9288 .add_xprt_test = clp->cl_mvops->session_trunk, 9289 .data = &xprtdata, 9290 }; 9291 9292 dprintk("--> %s clp=%p session=%p\n", __func__, clp, session); 9293 9294 status = _nfs4_proc_create_session(clp, cred); 9295 if (status) 9296 goto out; 9297 9298 /* Init or reset the session slot tables */ 9299 status = nfs4_setup_session_slot_tables(session); 9300 dprintk("slot table setup returned %d\n", status); 9301 if (status) 9302 goto out; 9303 9304 ptr = (unsigned *)&session->sess_id.data[0]; 9305 dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__, 9306 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]); 9307 rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata); 9308 out: 9309 return status; 9310 } 9311 9312 /* 9313 * Issue the over-the-wire RPC DESTROY_SESSION. 9314 * The caller must serialize access to this routine. 9315 */ 9316 int nfs4_proc_destroy_session(struct nfs4_session *session, 9317 const struct cred *cred) 9318 { 9319 struct rpc_message msg = { 9320 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION], 9321 .rpc_argp = session, 9322 .rpc_cred = cred, 9323 }; 9324 int status = 0; 9325 9326 /* session is still being setup */ 9327 if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state)) 9328 return 0; 9329 9330 status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 9331 RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN); 9332 trace_nfs4_destroy_session(session->clp, status); 9333 9334 if (status) 9335 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. " 9336 "Session has been destroyed regardless...\n", status); 9337 rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient); 9338 return status; 9339 } 9340 9341 /* 9342 * Renew the cl_session lease. 9343 */ 9344 struct nfs4_sequence_data { 9345 struct nfs_client *clp; 9346 struct nfs4_sequence_args args; 9347 struct nfs4_sequence_res res; 9348 }; 9349 9350 static void nfs41_sequence_release(void *data) 9351 { 9352 struct nfs4_sequence_data *calldata = data; 9353 struct nfs_client *clp = calldata->clp; 9354 9355 if (refcount_read(&clp->cl_count) > 1) 9356 nfs4_schedule_state_renewal(clp); 9357 nfs_put_client(clp); 9358 kfree(calldata); 9359 } 9360 9361 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9362 { 9363 switch(task->tk_status) { 9364 case -NFS4ERR_DELAY: 9365 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9366 return -EAGAIN; 9367 default: 9368 nfs4_schedule_lease_recovery(clp); 9369 } 9370 return 0; 9371 } 9372 9373 static void nfs41_sequence_call_done(struct rpc_task *task, void *data) 9374 { 9375 struct nfs4_sequence_data *calldata = data; 9376 struct nfs_client *clp = calldata->clp; 9377 9378 if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp)) 9379 return; 9380 9381 trace_nfs4_sequence(clp, task->tk_status); 9382 if (task->tk_status < 0 && !task->tk_client->cl_shutdown) { 9383 dprintk("%s ERROR %d\n", __func__, task->tk_status); 9384 if (refcount_read(&clp->cl_count) == 1) 9385 return; 9386 9387 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) { 9388 rpc_restart_call_prepare(task); 9389 return; 9390 } 9391 } 9392 dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred); 9393 } 9394 9395 static void nfs41_sequence_prepare(struct rpc_task *task, void *data) 9396 { 9397 struct nfs4_sequence_data *calldata = data; 9398 struct nfs_client *clp = calldata->clp; 9399 struct nfs4_sequence_args *args; 9400 struct nfs4_sequence_res *res; 9401 9402 args = task->tk_msg.rpc_argp; 9403 res = task->tk_msg.rpc_resp; 9404 9405 nfs4_setup_sequence(clp, args, res, task); 9406 } 9407 9408 static const struct rpc_call_ops nfs41_sequence_ops = { 9409 .rpc_call_done = nfs41_sequence_call_done, 9410 .rpc_call_prepare = nfs41_sequence_prepare, 9411 .rpc_release = nfs41_sequence_release, 9412 }; 9413 9414 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, 9415 const struct cred *cred, 9416 struct nfs4_slot *slot, 9417 bool is_privileged) 9418 { 9419 struct nfs4_sequence_data *calldata; 9420 struct rpc_message msg = { 9421 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE], 9422 .rpc_cred = cred, 9423 }; 9424 struct rpc_task_setup task_setup_data = { 9425 .rpc_client = clp->cl_rpcclient, 9426 .rpc_message = &msg, 9427 .callback_ops = &nfs41_sequence_ops, 9428 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE, 9429 }; 9430 struct rpc_task *ret; 9431 9432 ret = ERR_PTR(-EIO); 9433 if (!refcount_inc_not_zero(&clp->cl_count)) 9434 goto out_err; 9435 9436 ret = ERR_PTR(-ENOMEM); 9437 calldata = kzalloc(sizeof(*calldata), GFP_KERNEL); 9438 if (calldata == NULL) 9439 goto out_put_clp; 9440 nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged); 9441 nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot); 9442 msg.rpc_argp = &calldata->args; 9443 msg.rpc_resp = &calldata->res; 9444 calldata->clp = clp; 9445 task_setup_data.callback_data = calldata; 9446 9447 ret = rpc_run_task(&task_setup_data); 9448 if (IS_ERR(ret)) 9449 goto out_err; 9450 return ret; 9451 out_put_clp: 9452 nfs_put_client(clp); 9453 out_err: 9454 nfs41_release_slot(slot); 9455 return ret; 9456 } 9457 9458 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags) 9459 { 9460 struct rpc_task *task; 9461 int ret = 0; 9462 9463 if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0) 9464 return -EAGAIN; 9465 task = _nfs41_proc_sequence(clp, cred, NULL, false); 9466 if (IS_ERR(task)) 9467 ret = PTR_ERR(task); 9468 else 9469 rpc_put_task_async(task); 9470 dprintk("<-- %s status=%d\n", __func__, ret); 9471 return ret; 9472 } 9473 9474 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred) 9475 { 9476 struct rpc_task *task; 9477 int ret; 9478 9479 task = _nfs41_proc_sequence(clp, cred, NULL, true); 9480 if (IS_ERR(task)) { 9481 ret = PTR_ERR(task); 9482 goto out; 9483 } 9484 ret = rpc_wait_for_completion_task(task); 9485 if (!ret) 9486 ret = task->tk_status; 9487 rpc_put_task(task); 9488 out: 9489 dprintk("<-- %s status=%d\n", __func__, ret); 9490 return ret; 9491 } 9492 9493 struct nfs4_reclaim_complete_data { 9494 struct nfs_client *clp; 9495 struct nfs41_reclaim_complete_args arg; 9496 struct nfs41_reclaim_complete_res res; 9497 }; 9498 9499 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data) 9500 { 9501 struct nfs4_reclaim_complete_data *calldata = data; 9502 9503 nfs4_setup_sequence(calldata->clp, 9504 &calldata->arg.seq_args, 9505 &calldata->res.seq_res, 9506 task); 9507 } 9508 9509 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp) 9510 { 9511 switch(task->tk_status) { 9512 case 0: 9513 wake_up_all(&clp->cl_lock_waitq); 9514 fallthrough; 9515 case -NFS4ERR_COMPLETE_ALREADY: 9516 case -NFS4ERR_WRONG_CRED: /* What to do here? */ 9517 break; 9518 case -NFS4ERR_DELAY: 9519 rpc_delay(task, NFS4_POLL_RETRY_MAX); 9520 fallthrough; 9521 case -NFS4ERR_RETRY_UNCACHED_REP: 9522 case -EACCES: 9523 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n", 9524 __func__, task->tk_status, clp->cl_hostname); 9525 return -EAGAIN; 9526 case -NFS4ERR_BADSESSION: 9527 case -NFS4ERR_DEADSESSION: 9528 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 9529 break; 9530 default: 9531 nfs4_schedule_lease_recovery(clp); 9532 } 9533 return 0; 9534 } 9535 9536 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data) 9537 { 9538 struct nfs4_reclaim_complete_data *calldata = data; 9539 struct nfs_client *clp = calldata->clp; 9540 struct nfs4_sequence_res *res = &calldata->res.seq_res; 9541 9542 if (!nfs41_sequence_done(task, res)) 9543 return; 9544 9545 trace_nfs4_reclaim_complete(clp, task->tk_status); 9546 if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) { 9547 rpc_restart_call_prepare(task); 9548 return; 9549 } 9550 } 9551 9552 static void nfs4_free_reclaim_complete_data(void *data) 9553 { 9554 struct nfs4_reclaim_complete_data *calldata = data; 9555 9556 kfree(calldata); 9557 } 9558 9559 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = { 9560 .rpc_call_prepare = nfs4_reclaim_complete_prepare, 9561 .rpc_call_done = nfs4_reclaim_complete_done, 9562 .rpc_release = nfs4_free_reclaim_complete_data, 9563 }; 9564 9565 /* 9566 * Issue a global reclaim complete. 9567 */ 9568 static int nfs41_proc_reclaim_complete(struct nfs_client *clp, 9569 const struct cred *cred) 9570 { 9571 struct nfs4_reclaim_complete_data *calldata; 9572 struct rpc_message msg = { 9573 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE], 9574 .rpc_cred = cred, 9575 }; 9576 struct rpc_task_setup task_setup_data = { 9577 .rpc_client = clp->cl_rpcclient, 9578 .rpc_message = &msg, 9579 .callback_ops = &nfs4_reclaim_complete_call_ops, 9580 .flags = RPC_TASK_NO_ROUND_ROBIN, 9581 }; 9582 int status = -ENOMEM; 9583 9584 calldata = kzalloc(sizeof(*calldata), GFP_NOFS); 9585 if (calldata == NULL) 9586 goto out; 9587 calldata->clp = clp; 9588 calldata->arg.one_fs = 0; 9589 9590 nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1); 9591 msg.rpc_argp = &calldata->arg; 9592 msg.rpc_resp = &calldata->res; 9593 task_setup_data.callback_data = calldata; 9594 status = nfs4_call_sync_custom(&task_setup_data); 9595 out: 9596 dprintk("<-- %s status=%d\n", __func__, status); 9597 return status; 9598 } 9599 9600 static void 9601 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata) 9602 { 9603 struct nfs4_layoutget *lgp = calldata; 9604 struct nfs_server *server = NFS_SERVER(lgp->args.inode); 9605 9606 nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args, 9607 &lgp->res.seq_res, task); 9608 } 9609 9610 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata) 9611 { 9612 struct nfs4_layoutget *lgp = calldata; 9613 9614 nfs41_sequence_process(task, &lgp->res.seq_res); 9615 } 9616 9617 static int 9618 nfs4_layoutget_handle_exception(struct rpc_task *task, 9619 struct nfs4_layoutget *lgp, struct nfs4_exception *exception) 9620 { 9621 struct inode *inode = lgp->args.inode; 9622 struct nfs_server *server = NFS_SERVER(inode); 9623 struct pnfs_layout_hdr *lo = lgp->lo; 9624 int nfs4err = task->tk_status; 9625 int err, status = 0; 9626 LIST_HEAD(head); 9627 9628 dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status); 9629 9630 nfs4_sequence_free_slot(&lgp->res.seq_res); 9631 9632 switch (nfs4err) { 9633 case 0: 9634 goto out; 9635 9636 /* 9637 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs 9638 * on the file. set tk_status to -ENODATA to tell upper layer to 9639 * retry go inband. 9640 */ 9641 case -NFS4ERR_LAYOUTUNAVAILABLE: 9642 status = -ENODATA; 9643 goto out; 9644 /* 9645 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of 9646 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3). 9647 */ 9648 case -NFS4ERR_BADLAYOUT: 9649 status = -EOVERFLOW; 9650 goto out; 9651 /* 9652 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client 9653 * (or clients) writing to the same RAID stripe except when 9654 * the minlength argument is 0 (see RFC5661 section 18.43.3). 9655 * 9656 * Treat it like we would RECALLCONFLICT -- we retry for a little 9657 * while, and then eventually give up. 9658 */ 9659 case -NFS4ERR_LAYOUTTRYLATER: 9660 if (lgp->args.minlength == 0) { 9661 status = -EOVERFLOW; 9662 goto out; 9663 } 9664 status = -EBUSY; 9665 break; 9666 case -NFS4ERR_RECALLCONFLICT: 9667 case -NFS4ERR_RETURNCONFLICT: 9668 status = -ERECALLCONFLICT; 9669 break; 9670 case -NFS4ERR_DELEG_REVOKED: 9671 case -NFS4ERR_ADMIN_REVOKED: 9672 case -NFS4ERR_EXPIRED: 9673 case -NFS4ERR_BAD_STATEID: 9674 exception->timeout = 0; 9675 spin_lock(&inode->i_lock); 9676 /* If the open stateid was bad, then recover it. */ 9677 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 9678 !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) { 9679 spin_unlock(&inode->i_lock); 9680 exception->state = lgp->args.ctx->state; 9681 exception->stateid = &lgp->args.stateid; 9682 break; 9683 } 9684 9685 /* 9686 * Mark the bad layout state as invalid, then retry 9687 */ 9688 pnfs_mark_layout_stateid_invalid(lo, &head); 9689 spin_unlock(&inode->i_lock); 9690 nfs_commit_inode(inode, 0); 9691 pnfs_free_lseg_list(&head); 9692 status = -EAGAIN; 9693 goto out; 9694 } 9695 9696 err = nfs4_handle_exception(server, nfs4err, exception); 9697 if (!status) { 9698 if (exception->retry) 9699 status = -EAGAIN; 9700 else 9701 status = err; 9702 } 9703 out: 9704 return status; 9705 } 9706 9707 size_t max_response_pages(struct nfs_server *server) 9708 { 9709 u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 9710 return nfs_page_array_len(0, max_resp_sz); 9711 } 9712 9713 static void nfs4_layoutget_release(void *calldata) 9714 { 9715 struct nfs4_layoutget *lgp = calldata; 9716 9717 nfs4_sequence_free_slot(&lgp->res.seq_res); 9718 pnfs_layoutget_free(lgp); 9719 } 9720 9721 static const struct rpc_call_ops nfs4_layoutget_call_ops = { 9722 .rpc_call_prepare = nfs4_layoutget_prepare, 9723 .rpc_call_done = nfs4_layoutget_done, 9724 .rpc_release = nfs4_layoutget_release, 9725 }; 9726 9727 struct pnfs_layout_segment * 9728 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout) 9729 { 9730 struct inode *inode = lgp->args.inode; 9731 struct nfs_server *server = NFS_SERVER(inode); 9732 struct rpc_task *task; 9733 struct rpc_message msg = { 9734 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET], 9735 .rpc_argp = &lgp->args, 9736 .rpc_resp = &lgp->res, 9737 .rpc_cred = lgp->cred, 9738 }; 9739 struct rpc_task_setup task_setup_data = { 9740 .rpc_client = server->client, 9741 .rpc_message = &msg, 9742 .callback_ops = &nfs4_layoutget_call_ops, 9743 .callback_data = lgp, 9744 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF | 9745 RPC_TASK_MOVEABLE, 9746 }; 9747 struct pnfs_layout_segment *lseg = NULL; 9748 struct nfs4_exception exception = { 9749 .inode = inode, 9750 .timeout = *timeout, 9751 }; 9752 int status = 0; 9753 9754 nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0); 9755 9756 task = rpc_run_task(&task_setup_data); 9757 if (IS_ERR(task)) 9758 return ERR_CAST(task); 9759 9760 status = rpc_wait_for_completion_task(task); 9761 if (status != 0) 9762 goto out; 9763 9764 if (task->tk_status < 0) { 9765 status = nfs4_layoutget_handle_exception(task, lgp, &exception); 9766 *timeout = exception.timeout; 9767 } else if (lgp->res.layoutp->len == 0) { 9768 status = -EAGAIN; 9769 *timeout = nfs4_update_delay(&exception.timeout); 9770 } else 9771 lseg = pnfs_layout_process(lgp); 9772 out: 9773 trace_nfs4_layoutget(lgp->args.ctx, 9774 &lgp->args.range, 9775 &lgp->res.range, 9776 &lgp->res.stateid, 9777 status); 9778 9779 rpc_put_task(task); 9780 dprintk("<-- %s status=%d\n", __func__, status); 9781 if (status) 9782 return ERR_PTR(status); 9783 return lseg; 9784 } 9785 9786 static void 9787 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata) 9788 { 9789 struct nfs4_layoutreturn *lrp = calldata; 9790 9791 nfs4_setup_sequence(lrp->clp, 9792 &lrp->args.seq_args, 9793 &lrp->res.seq_res, 9794 task); 9795 if (!pnfs_layout_is_valid(lrp->args.layout)) 9796 rpc_exit(task, 0); 9797 } 9798 9799 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata) 9800 { 9801 struct nfs4_layoutreturn *lrp = calldata; 9802 struct nfs_server *server; 9803 9804 if (!nfs41_sequence_process(task, &lrp->res.seq_res)) 9805 return; 9806 9807 /* 9808 * Was there an RPC level error? Assume the call succeeded, 9809 * and that we need to release the layout 9810 */ 9811 if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) { 9812 lrp->res.lrs_present = 0; 9813 return; 9814 } 9815 9816 server = NFS_SERVER(lrp->args.inode); 9817 switch (task->tk_status) { 9818 case -NFS4ERR_OLD_STATEID: 9819 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid, 9820 &lrp->args.range, 9821 lrp->args.inode)) 9822 goto out_restart; 9823 fallthrough; 9824 default: 9825 task->tk_status = 0; 9826 fallthrough; 9827 case 0: 9828 break; 9829 case -NFS4ERR_DELAY: 9830 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN) 9831 break; 9832 goto out_restart; 9833 } 9834 return; 9835 out_restart: 9836 task->tk_status = 0; 9837 nfs4_sequence_free_slot(&lrp->res.seq_res); 9838 rpc_restart_call_prepare(task); 9839 } 9840 9841 static void nfs4_layoutreturn_release(void *calldata) 9842 { 9843 struct nfs4_layoutreturn *lrp = calldata; 9844 struct pnfs_layout_hdr *lo = lrp->args.layout; 9845 9846 pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range, 9847 lrp->res.lrs_present ? &lrp->res.stateid : NULL); 9848 nfs4_sequence_free_slot(&lrp->res.seq_res); 9849 if (lrp->ld_private.ops && lrp->ld_private.ops->free) 9850 lrp->ld_private.ops->free(&lrp->ld_private); 9851 pnfs_put_layout_hdr(lrp->args.layout); 9852 nfs_iput_and_deactive(lrp->inode); 9853 put_cred(lrp->cred); 9854 kfree(calldata); 9855 } 9856 9857 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = { 9858 .rpc_call_prepare = nfs4_layoutreturn_prepare, 9859 .rpc_call_done = nfs4_layoutreturn_done, 9860 .rpc_release = nfs4_layoutreturn_release, 9861 }; 9862 9863 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync) 9864 { 9865 struct rpc_task *task; 9866 struct rpc_message msg = { 9867 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN], 9868 .rpc_argp = &lrp->args, 9869 .rpc_resp = &lrp->res, 9870 .rpc_cred = lrp->cred, 9871 }; 9872 struct rpc_task_setup task_setup_data = { 9873 .rpc_client = NFS_SERVER(lrp->args.inode)->client, 9874 .rpc_message = &msg, 9875 .callback_ops = &nfs4_layoutreturn_call_ops, 9876 .callback_data = lrp, 9877 .flags = RPC_TASK_MOVEABLE, 9878 }; 9879 int status = 0; 9880 9881 nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client, 9882 NFS_SP4_MACH_CRED_PNFS_CLEANUP, 9883 &task_setup_data.rpc_client, &msg); 9884 9885 lrp->inode = nfs_igrab_and_active(lrp->args.inode); 9886 if (!sync) { 9887 if (!lrp->inode) { 9888 nfs4_layoutreturn_release(lrp); 9889 return -EAGAIN; 9890 } 9891 task_setup_data.flags |= RPC_TASK_ASYNC; 9892 } 9893 if (!lrp->inode) 9894 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9895 1); 9896 else 9897 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 9898 0); 9899 task = rpc_run_task(&task_setup_data); 9900 if (IS_ERR(task)) 9901 return PTR_ERR(task); 9902 if (sync) 9903 status = task->tk_status; 9904 trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status); 9905 dprintk("<-- %s status=%d\n", __func__, status); 9906 rpc_put_task(task); 9907 return status; 9908 } 9909 9910 static int 9911 _nfs4_proc_getdeviceinfo(struct nfs_server *server, 9912 struct pnfs_device *pdev, 9913 const struct cred *cred) 9914 { 9915 struct nfs4_getdeviceinfo_args args = { 9916 .pdev = pdev, 9917 .notify_types = NOTIFY_DEVICEID4_CHANGE | 9918 NOTIFY_DEVICEID4_DELETE, 9919 }; 9920 struct nfs4_getdeviceinfo_res res = { 9921 .pdev = pdev, 9922 }; 9923 struct rpc_message msg = { 9924 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO], 9925 .rpc_argp = &args, 9926 .rpc_resp = &res, 9927 .rpc_cred = cred, 9928 }; 9929 int status; 9930 9931 status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0); 9932 if (res.notification & ~args.notify_types) 9933 dprintk("%s: unsupported notification\n", __func__); 9934 if (res.notification != args.notify_types) 9935 pdev->nocache = 1; 9936 9937 trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status); 9938 9939 dprintk("<-- %s status=%d\n", __func__, status); 9940 9941 return status; 9942 } 9943 9944 int nfs4_proc_getdeviceinfo(struct nfs_server *server, 9945 struct pnfs_device *pdev, 9946 const struct cred *cred) 9947 { 9948 struct nfs4_exception exception = { }; 9949 int err; 9950 9951 do { 9952 err = nfs4_handle_exception(server, 9953 _nfs4_proc_getdeviceinfo(server, pdev, cred), 9954 &exception); 9955 } while (exception.retry); 9956 return err; 9957 } 9958 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo); 9959 9960 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata) 9961 { 9962 struct nfs4_layoutcommit_data *data = calldata; 9963 struct nfs_server *server = NFS_SERVER(data->args.inode); 9964 9965 nfs4_setup_sequence(server->nfs_client, 9966 &data->args.seq_args, 9967 &data->res.seq_res, 9968 task); 9969 } 9970 9971 static void 9972 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata) 9973 { 9974 struct nfs4_layoutcommit_data *data = calldata; 9975 struct nfs_server *server = NFS_SERVER(data->args.inode); 9976 9977 if (!nfs41_sequence_done(task, &data->res.seq_res)) 9978 return; 9979 9980 switch (task->tk_status) { /* Just ignore these failures */ 9981 case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */ 9982 case -NFS4ERR_BADIOMODE: /* no IOMODE_RW layout for range */ 9983 case -NFS4ERR_BADLAYOUT: /* no layout */ 9984 case -NFS4ERR_GRACE: /* loca_recalim always false */ 9985 task->tk_status = 0; 9986 break; 9987 case 0: 9988 break; 9989 default: 9990 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) { 9991 rpc_restart_call_prepare(task); 9992 return; 9993 } 9994 } 9995 } 9996 9997 static void nfs4_layoutcommit_release(void *calldata) 9998 { 9999 struct nfs4_layoutcommit_data *data = calldata; 10000 10001 pnfs_cleanup_layoutcommit(data); 10002 nfs_post_op_update_inode_force_wcc(data->args.inode, 10003 data->res.fattr); 10004 put_cred(data->cred); 10005 nfs_iput_and_deactive(data->inode); 10006 kfree(data); 10007 } 10008 10009 static const struct rpc_call_ops nfs4_layoutcommit_ops = { 10010 .rpc_call_prepare = nfs4_layoutcommit_prepare, 10011 .rpc_call_done = nfs4_layoutcommit_done, 10012 .rpc_release = nfs4_layoutcommit_release, 10013 }; 10014 10015 int 10016 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync) 10017 { 10018 struct rpc_message msg = { 10019 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT], 10020 .rpc_argp = &data->args, 10021 .rpc_resp = &data->res, 10022 .rpc_cred = data->cred, 10023 }; 10024 struct rpc_task_setup task_setup_data = { 10025 .task = &data->task, 10026 .rpc_client = NFS_CLIENT(data->args.inode), 10027 .rpc_message = &msg, 10028 .callback_ops = &nfs4_layoutcommit_ops, 10029 .callback_data = data, 10030 .flags = RPC_TASK_MOVEABLE, 10031 }; 10032 struct rpc_task *task; 10033 int status = 0; 10034 10035 dprintk("NFS: initiating layoutcommit call. sync %d " 10036 "lbw: %llu inode %lu\n", sync, 10037 data->args.lastbytewritten, 10038 data->args.inode->i_ino); 10039 10040 if (!sync) { 10041 data->inode = nfs_igrab_and_active(data->args.inode); 10042 if (data->inode == NULL) { 10043 nfs4_layoutcommit_release(data); 10044 return -EAGAIN; 10045 } 10046 task_setup_data.flags = RPC_TASK_ASYNC; 10047 } 10048 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0); 10049 task = rpc_run_task(&task_setup_data); 10050 if (IS_ERR(task)) 10051 return PTR_ERR(task); 10052 if (sync) 10053 status = task->tk_status; 10054 trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status); 10055 dprintk("%s: status %d\n", __func__, status); 10056 rpc_put_task(task); 10057 return status; 10058 } 10059 10060 /* 10061 * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if 10062 * possible) as per RFC3530bis and RFC5661 Security Considerations sections 10063 */ 10064 static int 10065 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10066 struct nfs_fsinfo *info, 10067 struct nfs4_secinfo_flavors *flavors, bool use_integrity) 10068 { 10069 struct nfs41_secinfo_no_name_args args = { 10070 .style = SECINFO_STYLE_CURRENT_FH, 10071 }; 10072 struct nfs4_secinfo_res res = { 10073 .flavors = flavors, 10074 }; 10075 struct rpc_message msg = { 10076 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME], 10077 .rpc_argp = &args, 10078 .rpc_resp = &res, 10079 }; 10080 struct nfs4_call_sync_data data = { 10081 .seq_server = server, 10082 .seq_args = &args.seq_args, 10083 .seq_res = &res.seq_res, 10084 }; 10085 struct rpc_task_setup task_setup = { 10086 .rpc_client = server->client, 10087 .rpc_message = &msg, 10088 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops, 10089 .callback_data = &data, 10090 .flags = RPC_TASK_NO_ROUND_ROBIN, 10091 }; 10092 const struct cred *cred = NULL; 10093 int status; 10094 10095 if (use_integrity) { 10096 task_setup.rpc_client = server->nfs_client->cl_rpcclient; 10097 10098 cred = nfs4_get_clid_cred(server->nfs_client); 10099 msg.rpc_cred = cred; 10100 } 10101 10102 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0); 10103 status = nfs4_call_sync_custom(&task_setup); 10104 dprintk("<-- %s status=%d\n", __func__, status); 10105 10106 put_cred(cred); 10107 10108 return status; 10109 } 10110 10111 static int 10112 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle, 10113 struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors) 10114 { 10115 struct nfs4_exception exception = { 10116 .interruptible = true, 10117 }; 10118 int err; 10119 do { 10120 /* first try using integrity protection */ 10121 err = -NFS4ERR_WRONGSEC; 10122 10123 /* try to use integrity protection with machine cred */ 10124 if (_nfs4_is_integrity_protected(server->nfs_client)) 10125 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10126 flavors, true); 10127 10128 /* 10129 * if unable to use integrity protection, or SECINFO with 10130 * integrity protection returns NFS4ERR_WRONGSEC (which is 10131 * disallowed by spec, but exists in deployed servers) use 10132 * the current filesystem's rpc_client and the user cred. 10133 */ 10134 if (err == -NFS4ERR_WRONGSEC) 10135 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, 10136 flavors, false); 10137 10138 switch (err) { 10139 case 0: 10140 case -NFS4ERR_WRONGSEC: 10141 case -ENOTSUPP: 10142 goto out; 10143 default: 10144 err = nfs4_handle_exception(server, err, &exception); 10145 } 10146 } while (exception.retry); 10147 out: 10148 return err; 10149 } 10150 10151 static int 10152 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle, 10153 struct nfs_fsinfo *info) 10154 { 10155 int err; 10156 struct page *page; 10157 rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; 10158 struct nfs4_secinfo_flavors *flavors; 10159 struct nfs4_secinfo4 *secinfo; 10160 int i; 10161 10162 page = alloc_page(GFP_KERNEL); 10163 if (!page) { 10164 err = -ENOMEM; 10165 goto out; 10166 } 10167 10168 flavors = page_address(page); 10169 err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors); 10170 10171 /* 10172 * Fall back on "guess and check" method if 10173 * the server doesn't support SECINFO_NO_NAME 10174 */ 10175 if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) { 10176 err = nfs4_find_root_sec(server, fhandle, info); 10177 goto out_freepage; 10178 } 10179 if (err) 10180 goto out_freepage; 10181 10182 for (i = 0; i < flavors->num_flavors; i++) { 10183 secinfo = &flavors->flavors[i]; 10184 10185 switch (secinfo->flavor) { 10186 case RPC_AUTH_NULL: 10187 case RPC_AUTH_UNIX: 10188 case RPC_AUTH_GSS: 10189 flavor = rpcauth_get_pseudoflavor(secinfo->flavor, 10190 &secinfo->flavor_info); 10191 break; 10192 default: 10193 flavor = RPC_AUTH_MAXFLAVOR; 10194 break; 10195 } 10196 10197 if (!nfs_auth_info_match(&server->auth_info, flavor)) 10198 flavor = RPC_AUTH_MAXFLAVOR; 10199 10200 if (flavor != RPC_AUTH_MAXFLAVOR) { 10201 err = nfs4_lookup_root_sec(server, fhandle, 10202 info, flavor); 10203 if (!err) 10204 break; 10205 } 10206 } 10207 10208 if (flavor == RPC_AUTH_MAXFLAVOR) 10209 err = -EPERM; 10210 10211 out_freepage: 10212 put_page(page); 10213 if (err == -EACCES) 10214 return -EPERM; 10215 out: 10216 return err; 10217 } 10218 10219 static int _nfs41_test_stateid(struct nfs_server *server, 10220 nfs4_stateid *stateid, 10221 const struct cred *cred) 10222 { 10223 int status; 10224 struct nfs41_test_stateid_args args = { 10225 .stateid = stateid, 10226 }; 10227 struct nfs41_test_stateid_res res; 10228 struct rpc_message msg = { 10229 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID], 10230 .rpc_argp = &args, 10231 .rpc_resp = &res, 10232 .rpc_cred = cred, 10233 }; 10234 struct rpc_clnt *rpc_client = server->client; 10235 10236 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10237 &rpc_client, &msg); 10238 10239 dprintk("NFS call test_stateid %p\n", stateid); 10240 nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1); 10241 status = nfs4_call_sync_sequence(rpc_client, server, &msg, 10242 &args.seq_args, &res.seq_res); 10243 if (status != NFS_OK) { 10244 dprintk("NFS reply test_stateid: failed, %d\n", status); 10245 return status; 10246 } 10247 dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status); 10248 return -res.status; 10249 } 10250 10251 static void nfs4_handle_delay_or_session_error(struct nfs_server *server, 10252 int err, struct nfs4_exception *exception) 10253 { 10254 exception->retry = 0; 10255 switch(err) { 10256 case -NFS4ERR_DELAY: 10257 case -NFS4ERR_RETRY_UNCACHED_REP: 10258 nfs4_handle_exception(server, err, exception); 10259 break; 10260 case -NFS4ERR_BADSESSION: 10261 case -NFS4ERR_BADSLOT: 10262 case -NFS4ERR_BAD_HIGH_SLOT: 10263 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 10264 case -NFS4ERR_DEADSESSION: 10265 nfs4_do_handle_exception(server, err, exception); 10266 } 10267 } 10268 10269 /** 10270 * nfs41_test_stateid - perform a TEST_STATEID operation 10271 * 10272 * @server: server / transport on which to perform the operation 10273 * @stateid: state ID to test 10274 * @cred: credential 10275 * 10276 * Returns NFS_OK if the server recognizes that "stateid" is valid. 10277 * Otherwise a negative NFS4ERR value is returned if the operation 10278 * failed or the state ID is not currently valid. 10279 */ 10280 static int nfs41_test_stateid(struct nfs_server *server, 10281 nfs4_stateid *stateid, 10282 const struct cred *cred) 10283 { 10284 struct nfs4_exception exception = { 10285 .interruptible = true, 10286 }; 10287 int err; 10288 do { 10289 err = _nfs41_test_stateid(server, stateid, cred); 10290 nfs4_handle_delay_or_session_error(server, err, &exception); 10291 } while (exception.retry); 10292 return err; 10293 } 10294 10295 struct nfs_free_stateid_data { 10296 struct nfs_server *server; 10297 struct nfs41_free_stateid_args args; 10298 struct nfs41_free_stateid_res res; 10299 }; 10300 10301 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata) 10302 { 10303 struct nfs_free_stateid_data *data = calldata; 10304 nfs4_setup_sequence(data->server->nfs_client, 10305 &data->args.seq_args, 10306 &data->res.seq_res, 10307 task); 10308 } 10309 10310 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata) 10311 { 10312 struct nfs_free_stateid_data *data = calldata; 10313 10314 nfs41_sequence_done(task, &data->res.seq_res); 10315 10316 switch (task->tk_status) { 10317 case -NFS4ERR_DELAY: 10318 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN) 10319 rpc_restart_call_prepare(task); 10320 } 10321 } 10322 10323 static void nfs41_free_stateid_release(void *calldata) 10324 { 10325 struct nfs_free_stateid_data *data = calldata; 10326 struct nfs_client *clp = data->server->nfs_client; 10327 10328 nfs_put_client(clp); 10329 kfree(calldata); 10330 } 10331 10332 static const struct rpc_call_ops nfs41_free_stateid_ops = { 10333 .rpc_call_prepare = nfs41_free_stateid_prepare, 10334 .rpc_call_done = nfs41_free_stateid_done, 10335 .rpc_release = nfs41_free_stateid_release, 10336 }; 10337 10338 /** 10339 * nfs41_free_stateid - perform a FREE_STATEID operation 10340 * 10341 * @server: server / transport on which to perform the operation 10342 * @stateid: state ID to release 10343 * @cred: credential 10344 * @privileged: set to true if this call needs to be privileged 10345 * 10346 * Note: this function is always asynchronous. 10347 */ 10348 static int nfs41_free_stateid(struct nfs_server *server, 10349 const nfs4_stateid *stateid, 10350 const struct cred *cred, 10351 bool privileged) 10352 { 10353 struct rpc_message msg = { 10354 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID], 10355 .rpc_cred = cred, 10356 }; 10357 struct rpc_task_setup task_setup = { 10358 .rpc_client = server->client, 10359 .rpc_message = &msg, 10360 .callback_ops = &nfs41_free_stateid_ops, 10361 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE, 10362 }; 10363 struct nfs_free_stateid_data *data; 10364 struct rpc_task *task; 10365 struct nfs_client *clp = server->nfs_client; 10366 10367 if (!refcount_inc_not_zero(&clp->cl_count)) 10368 return -EIO; 10369 10370 nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID, 10371 &task_setup.rpc_client, &msg); 10372 10373 dprintk("NFS call free_stateid %p\n", stateid); 10374 data = kmalloc(sizeof(*data), GFP_KERNEL); 10375 if (!data) 10376 return -ENOMEM; 10377 data->server = server; 10378 nfs4_stateid_copy(&data->args.stateid, stateid); 10379 10380 task_setup.callback_data = data; 10381 10382 msg.rpc_argp = &data->args; 10383 msg.rpc_resp = &data->res; 10384 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged); 10385 task = rpc_run_task(&task_setup); 10386 if (IS_ERR(task)) 10387 return PTR_ERR(task); 10388 rpc_put_task(task); 10389 return 0; 10390 } 10391 10392 static void 10393 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) 10394 { 10395 const struct cred *cred = lsp->ls_state->owner->so_cred; 10396 10397 nfs41_free_stateid(server, &lsp->ls_stateid, cred, false); 10398 nfs4_free_lock_state(server, lsp); 10399 } 10400 10401 static bool nfs41_match_stateid(const nfs4_stateid *s1, 10402 const nfs4_stateid *s2) 10403 { 10404 if (s1->type != s2->type) 10405 return false; 10406 10407 if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0) 10408 return false; 10409 10410 if (s1->seqid == s2->seqid) 10411 return true; 10412 10413 return s1->seqid == 0 || s2->seqid == 0; 10414 } 10415 10416 #endif /* CONFIG_NFS_V4_1 */ 10417 10418 static bool nfs4_match_stateid(const nfs4_stateid *s1, 10419 const nfs4_stateid *s2) 10420 { 10421 return nfs4_stateid_match(s1, s2); 10422 } 10423 10424 10425 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = { 10426 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10427 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10428 .recover_open = nfs4_open_reclaim, 10429 .recover_lock = nfs4_lock_reclaim, 10430 .establish_clid = nfs4_init_clientid, 10431 .detect_trunking = nfs40_discover_server_trunking, 10432 }; 10433 10434 #if defined(CONFIG_NFS_V4_1) 10435 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = { 10436 .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT, 10437 .state_flag_bit = NFS_STATE_RECLAIM_REBOOT, 10438 .recover_open = nfs4_open_reclaim, 10439 .recover_lock = nfs4_lock_reclaim, 10440 .establish_clid = nfs41_init_clientid, 10441 .reclaim_complete = nfs41_proc_reclaim_complete, 10442 .detect_trunking = nfs41_discover_server_trunking, 10443 }; 10444 #endif /* CONFIG_NFS_V4_1 */ 10445 10446 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = { 10447 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10448 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10449 .recover_open = nfs40_open_expired, 10450 .recover_lock = nfs4_lock_expired, 10451 .establish_clid = nfs4_init_clientid, 10452 }; 10453 10454 #if defined(CONFIG_NFS_V4_1) 10455 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = { 10456 .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE, 10457 .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE, 10458 .recover_open = nfs41_open_expired, 10459 .recover_lock = nfs41_lock_expired, 10460 .establish_clid = nfs41_init_clientid, 10461 }; 10462 #endif /* CONFIG_NFS_V4_1 */ 10463 10464 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = { 10465 .sched_state_renewal = nfs4_proc_async_renew, 10466 .get_state_renewal_cred = nfs4_get_renew_cred, 10467 .renew_lease = nfs4_proc_renew, 10468 }; 10469 10470 #if defined(CONFIG_NFS_V4_1) 10471 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = { 10472 .sched_state_renewal = nfs41_proc_async_sequence, 10473 .get_state_renewal_cred = nfs4_get_machine_cred, 10474 .renew_lease = nfs4_proc_sequence, 10475 }; 10476 #endif 10477 10478 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = { 10479 .get_locations = _nfs40_proc_get_locations, 10480 .fsid_present = _nfs40_proc_fsid_present, 10481 }; 10482 10483 #if defined(CONFIG_NFS_V4_1) 10484 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = { 10485 .get_locations = _nfs41_proc_get_locations, 10486 .fsid_present = _nfs41_proc_fsid_present, 10487 }; 10488 #endif /* CONFIG_NFS_V4_1 */ 10489 10490 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = { 10491 .minor_version = 0, 10492 .init_caps = NFS_CAP_READDIRPLUS 10493 | NFS_CAP_ATOMIC_OPEN 10494 | NFS_CAP_POSIX_LOCK, 10495 .init_client = nfs40_init_client, 10496 .shutdown_client = nfs40_shutdown_client, 10497 .match_stateid = nfs4_match_stateid, 10498 .find_root_sec = nfs4_find_root_sec, 10499 .free_lock_state = nfs4_release_lockowner, 10500 .test_and_free_expired = nfs40_test_and_free_expired_stateid, 10501 .alloc_seqid = nfs_alloc_seqid, 10502 .call_sync_ops = &nfs40_call_sync_ops, 10503 .reboot_recovery_ops = &nfs40_reboot_recovery_ops, 10504 .nograce_recovery_ops = &nfs40_nograce_recovery_ops, 10505 .state_renewal_ops = &nfs40_state_renewal_ops, 10506 .mig_recovery_ops = &nfs40_mig_recovery_ops, 10507 }; 10508 10509 #if defined(CONFIG_NFS_V4_1) 10510 static struct nfs_seqid * 10511 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2) 10512 { 10513 return NULL; 10514 } 10515 10516 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { 10517 .minor_version = 1, 10518 .init_caps = NFS_CAP_READDIRPLUS 10519 | NFS_CAP_ATOMIC_OPEN 10520 | NFS_CAP_POSIX_LOCK 10521 | NFS_CAP_STATEID_NFSV41 10522 | NFS_CAP_ATOMIC_OPEN_V1 10523 | NFS_CAP_LGOPEN 10524 | NFS_CAP_MOVEABLE, 10525 .init_client = nfs41_init_client, 10526 .shutdown_client = nfs41_shutdown_client, 10527 .match_stateid = nfs41_match_stateid, 10528 .find_root_sec = nfs41_find_root_sec, 10529 .free_lock_state = nfs41_free_lock_state, 10530 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10531 .alloc_seqid = nfs_alloc_no_seqid, 10532 .session_trunk = nfs4_test_session_trunk, 10533 .call_sync_ops = &nfs41_call_sync_ops, 10534 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10535 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10536 .state_renewal_ops = &nfs41_state_renewal_ops, 10537 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10538 }; 10539 #endif 10540 10541 #if defined(CONFIG_NFS_V4_2) 10542 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { 10543 .minor_version = 2, 10544 .init_caps = NFS_CAP_READDIRPLUS 10545 | NFS_CAP_ATOMIC_OPEN 10546 | NFS_CAP_POSIX_LOCK 10547 | NFS_CAP_STATEID_NFSV41 10548 | NFS_CAP_ATOMIC_OPEN_V1 10549 | NFS_CAP_LGOPEN 10550 | NFS_CAP_ALLOCATE 10551 | NFS_CAP_COPY 10552 | NFS_CAP_OFFLOAD_CANCEL 10553 | NFS_CAP_COPY_NOTIFY 10554 | NFS_CAP_DEALLOCATE 10555 | NFS_CAP_SEEK 10556 | NFS_CAP_LAYOUTSTATS 10557 | NFS_CAP_CLONE 10558 | NFS_CAP_LAYOUTERROR 10559 | NFS_CAP_READ_PLUS 10560 | NFS_CAP_MOVEABLE, 10561 .init_client = nfs41_init_client, 10562 .shutdown_client = nfs41_shutdown_client, 10563 .match_stateid = nfs41_match_stateid, 10564 .find_root_sec = nfs41_find_root_sec, 10565 .free_lock_state = nfs41_free_lock_state, 10566 .call_sync_ops = &nfs41_call_sync_ops, 10567 .test_and_free_expired = nfs41_test_and_free_expired_stateid, 10568 .alloc_seqid = nfs_alloc_no_seqid, 10569 .session_trunk = nfs4_test_session_trunk, 10570 .reboot_recovery_ops = &nfs41_reboot_recovery_ops, 10571 .nograce_recovery_ops = &nfs41_nograce_recovery_ops, 10572 .state_renewal_ops = &nfs41_state_renewal_ops, 10573 .mig_recovery_ops = &nfs41_mig_recovery_ops, 10574 }; 10575 #endif 10576 10577 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = { 10578 [0] = &nfs_v4_0_minor_ops, 10579 #if defined(CONFIG_NFS_V4_1) 10580 [1] = &nfs_v4_1_minor_ops, 10581 #endif 10582 #if defined(CONFIG_NFS_V4_2) 10583 [2] = &nfs_v4_2_minor_ops, 10584 #endif 10585 }; 10586 10587 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size) 10588 { 10589 ssize_t error, error2, error3; 10590 size_t left = size; 10591 10592 error = generic_listxattr(dentry, list, left); 10593 if (error < 0) 10594 return error; 10595 if (list) { 10596 list += error; 10597 left -= error; 10598 } 10599 10600 error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, left); 10601 if (error2 < 0) 10602 return error2; 10603 10604 if (list) { 10605 list += error2; 10606 left -= error2; 10607 } 10608 10609 error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, left); 10610 if (error3 < 0) 10611 return error3; 10612 10613 error += error2 + error3; 10614 if (size && error > size) 10615 return -ERANGE; 10616 return error; 10617 } 10618 10619 static void nfs4_enable_swap(struct inode *inode) 10620 { 10621 /* The state manager thread must always be running. 10622 * It will notice the client is a swapper, and stay put. 10623 */ 10624 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10625 10626 nfs4_schedule_state_manager(clp); 10627 } 10628 10629 static void nfs4_disable_swap(struct inode *inode) 10630 { 10631 /* The state manager thread will now exit once it is 10632 * woken. 10633 */ 10634 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; 10635 10636 set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); 10637 clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state); 10638 wake_up_var(&clp->cl_state); 10639 } 10640 10641 static const struct inode_operations nfs4_dir_inode_operations = { 10642 .create = nfs_create, 10643 .lookup = nfs_lookup, 10644 .atomic_open = nfs_atomic_open, 10645 .link = nfs_link, 10646 .unlink = nfs_unlink, 10647 .symlink = nfs_symlink, 10648 .mkdir = nfs_mkdir, 10649 .rmdir = nfs_rmdir, 10650 .mknod = nfs_mknod, 10651 .rename = nfs_rename, 10652 .permission = nfs_permission, 10653 .getattr = nfs_getattr, 10654 .setattr = nfs_setattr, 10655 .listxattr = nfs4_listxattr, 10656 }; 10657 10658 static const struct inode_operations nfs4_file_inode_operations = { 10659 .permission = nfs_permission, 10660 .getattr = nfs_getattr, 10661 .setattr = nfs_setattr, 10662 .listxattr = nfs4_listxattr, 10663 }; 10664 10665 const struct nfs_rpc_ops nfs_v4_clientops = { 10666 .version = 4, /* protocol version */ 10667 .dentry_ops = &nfs4_dentry_operations, 10668 .dir_inode_ops = &nfs4_dir_inode_operations, 10669 .file_inode_ops = &nfs4_file_inode_operations, 10670 .file_ops = &nfs4_file_operations, 10671 .getroot = nfs4_proc_get_root, 10672 .submount = nfs4_submount, 10673 .try_get_tree = nfs4_try_get_tree, 10674 .getattr = nfs4_proc_getattr, 10675 .setattr = nfs4_proc_setattr, 10676 .lookup = nfs4_proc_lookup, 10677 .lookupp = nfs4_proc_lookupp, 10678 .access = nfs4_proc_access, 10679 .readlink = nfs4_proc_readlink, 10680 .create = nfs4_proc_create, 10681 .remove = nfs4_proc_remove, 10682 .unlink_setup = nfs4_proc_unlink_setup, 10683 .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare, 10684 .unlink_done = nfs4_proc_unlink_done, 10685 .rename_setup = nfs4_proc_rename_setup, 10686 .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare, 10687 .rename_done = nfs4_proc_rename_done, 10688 .link = nfs4_proc_link, 10689 .symlink = nfs4_proc_symlink, 10690 .mkdir = nfs4_proc_mkdir, 10691 .rmdir = nfs4_proc_rmdir, 10692 .readdir = nfs4_proc_readdir, 10693 .mknod = nfs4_proc_mknod, 10694 .statfs = nfs4_proc_statfs, 10695 .fsinfo = nfs4_proc_fsinfo, 10696 .pathconf = nfs4_proc_pathconf, 10697 .set_capabilities = nfs4_server_capabilities, 10698 .decode_dirent = nfs4_decode_dirent, 10699 .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare, 10700 .read_setup = nfs4_proc_read_setup, 10701 .read_done = nfs4_read_done, 10702 .write_setup = nfs4_proc_write_setup, 10703 .write_done = nfs4_write_done, 10704 .commit_setup = nfs4_proc_commit_setup, 10705 .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare, 10706 .commit_done = nfs4_commit_done, 10707 .lock = nfs4_proc_lock, 10708 .clear_acl_cache = nfs4_zap_acl_attr, 10709 .close_context = nfs4_close_context, 10710 .open_context = nfs4_atomic_open, 10711 .have_delegation = nfs4_have_delegation, 10712 .alloc_client = nfs4_alloc_client, 10713 .init_client = nfs4_init_client, 10714 .free_client = nfs4_free_client, 10715 .create_server = nfs4_create_server, 10716 .clone_server = nfs_clone_server, 10717 .discover_trunking = nfs4_discover_trunking, 10718 .enable_swap = nfs4_enable_swap, 10719 .disable_swap = nfs4_disable_swap, 10720 }; 10721 10722 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = { 10723 .name = XATTR_NAME_NFSV4_ACL, 10724 .list = nfs4_xattr_list_nfs4_acl, 10725 .get = nfs4_xattr_get_nfs4_acl, 10726 .set = nfs4_xattr_set_nfs4_acl, 10727 }; 10728 10729 #if defined(CONFIG_NFS_V4_1) 10730 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = { 10731 .name = XATTR_NAME_NFSV4_DACL, 10732 .list = nfs4_xattr_list_nfs4_dacl, 10733 .get = nfs4_xattr_get_nfs4_dacl, 10734 .set = nfs4_xattr_set_nfs4_dacl, 10735 }; 10736 10737 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = { 10738 .name = XATTR_NAME_NFSV4_SACL, 10739 .list = nfs4_xattr_list_nfs4_sacl, 10740 .get = nfs4_xattr_get_nfs4_sacl, 10741 .set = nfs4_xattr_set_nfs4_sacl, 10742 }; 10743 #endif 10744 10745 #ifdef CONFIG_NFS_V4_2 10746 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = { 10747 .prefix = XATTR_USER_PREFIX, 10748 .get = nfs4_xattr_get_nfs4_user, 10749 .set = nfs4_xattr_set_nfs4_user, 10750 }; 10751 #endif 10752 10753 const struct xattr_handler *nfs4_xattr_handlers[] = { 10754 &nfs4_xattr_nfs4_acl_handler, 10755 #if defined(CONFIG_NFS_V4_1) 10756 &nfs4_xattr_nfs4_dacl_handler, 10757 &nfs4_xattr_nfs4_sacl_handler, 10758 #endif 10759 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 10760 &nfs4_xattr_nfs4_label_handler, 10761 #endif 10762 #ifdef CONFIG_NFS_V4_2 10763 &nfs4_xattr_nfs4_user_handler, 10764 #endif 10765 NULL 10766 }; 10767